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KVR Developer Challenge 2023

Voting is CLOSED! The winners have been announced here (FYI they are listed below in the order they finished - the winner at the top)! Thank you and congratulations to everyone!

KVR Developer Challenge 2023

KVRDC23 Prize Fund


Donations Closed
See You Next Time!

Welcome to the KVR Developer Challenge 2023, the ninth free-for-all audio plugin / audio application / soundware design event.

The "KVR Developer Challenge" is for anyone who develops Audio Plugins or Applications and Soundware. The challenge is to create and release a brand new free audio plugin, application or sound library / pack / set that will benefit the community at large.

Creativity is key, it can be as simple or as complex as you want - KVR members will vote on the entries and pick the eventual winner using whatever criteria they choose to.

Five cash prizes will be awarded to the top entries and a wildcard pick. Prize moneys are sponsored by the community-funded KVR Developer Challenge 2023 donation pool.

The KVR Developer Challenge began in 2006 and has occurred every 2-3 years ever since.

2021 gave us WhispAir by Full Bucket Music, GR-8 by Phuturetone, Virtuosity Drums by Versilian Studios, and FKFX Influx by FKFX. 2018 delivered gems such as ProF.E.T. by Ignite Amps, Deducktion by Dead Duck Software and MPS by Full Bucket Music. We had Youlean Loudness Meter, Lagrange by Ursa DSP and Spaceship Delay from Musical Entropy in 2016, Multiply by Acon Digital, Nova-67P by vladg/sound and Emissary by Ignite Amps in 2014, and so it goes on...

Check out 2012, 2009, 2007, and the original in 2006 when Triple Cheese by u-he won the show!

Discuss in the dedicated KVR Developer Challenge forum

KVR Developer Challenge 2023 Entries


Plugin / App

Plugin / App

Plugin / App



by Adam Szabo
Reverb, Shimmer Reverb

Introducing the Solaris VST reverb plugin, a mesmerizing tool that transports your audio into ethereal soundscapes.

With its shimmering effect, it adds a celestial aura to your music, and creates cascading, sparkling reverberations. The Solaris plugin is your gateway to celestial realms, empowering you to create enchanting textures and transcendental atmospheres within your compositions. With its low CPU usage, it can also function as a modern reverb unit for many different applications.

It is available as a 32 and 64-bit VST2 and 64-bit VST3 plugin for Windows.

Preset demonstration: YouTube.com/watch?v=pNi94F8EiT8

MONSTER OctaChord v1
by Monster DAW
Chord Library, Acoustic, chord composer, Chord Generator, chord loops, Keyboards, Piano / Keys, Synth
MONSTER OctaChord v1

What is MONSTER OctaChord?

  • Are you aspiring to become a music producer, but struggling to create captivating chords for your next hit?
  • Have you followed numerous YouTube tutorials on "how to make chords," only to find it incredibly challenging to master?
  • Are you in need of a spark to compose a song?
  • Or do you want to make music but didn't have music theory knowledge at all?

Fear not, because MONSTER OctaChord is here to save the day.


With just pressing a single note, MONSTER OctaChord effortlessly generates complex or simple chords in various genres of your choice. Whether you're into LoFi, Techno, Cinematic, R'n'B, Reggaeton, Pop, or more, this plugin has got you covered.

Each preset in MONSTER OctaChord includes a complete set of 12 scales. This means you can choose whether your song is in G Major, D Major, F# minor, B minor, or whatever key you prefer.

To complement the chord sets, MONSTER OctaChord also provides an Ornament set. These ornaments include fill-ins, melodic lines, and sound effects that perfectly match the chords. No matter which keys you play, you'll have the right accompaniment.

Watch this walkthrough of MONSTER OctaChord features and how to use it:


Other features of MONSTER OctaChord are:

  • Instant Chord Progression for your song, no music theory needed.

  • Cover many music genres.

  • New FREE presets will be added continuously in the future.

  • Master Volume and Master Panning.

  • Master Reverb FX and Master Delay FX.
  • Chords Volume and Ornament Volume (And some presets have additional Vinyl Volume).

MONSTER OctaChord Installation

Monster OctaChord is a free plugin available in Windows VST2/VST3 64-bit and Mac VST2/VST3/Audio Unit 64-bit formats.

There's no installer so you have to put the file manually. Read and follow these steps:

  1. Download the "MONSTER OctaChord v1.zip" according to your computer's OS (Mac or Windows).
  2. UnZip the "MONSTER OctaChord v1.zip".
  3. If you use Windows and Cubase, Studio One, Ableton Live, Reaper, FL Studio, Reason, etc, put the .dll file to the VST2 folder OR the .vst3 file to the VST3 folder of your DAW (If you don't know the location, googling "VST folder location windows").
  4. If you use Mac and Cubase, Studio One, Ableton Live, Reaper, FL Studio, Reason, etc, put the .vst file to the VST2 folder OR the .vst3 file to the VST3 folder of your DAW (If you don't know the location, googling "VST folder location mac"). If you use GarageBand or Logic Pro, put the .component file to the Audio Unit folder of your DAW (If you don't know the location, googling "audio unit folder location mac").
  5. Copy the folder "MONSTER OctaChord v1 Library" to your external hard disk or any hard disk.
  6. Fire up your DAW and load the MONSTER OctaChord plugin and it will ask the location of the sound library. Choose the "MONSTER OctaChord v1 Library" which you have copied on step 5.
  7. ENJOY the plugin.

NOTES: For Mac user, MONSTER OctaChord v1 plugin is not signed yet so if you encounter problem that the plugin is detected as harmful (actually it's not), you can try to googling on "how to install unsigned software on Mac OS X".

Or you can follow the direction in here: wikihow.com/Install-Software-from-Unsigned-Developers-on-a-Mac

Wave Breaker
by Press Play
Limiter, Brickwall Limiter, Lookahead Limiter, True Peak Limiter
Wave Breaker

Break your waves

Wave Breaker is a true-peak stereo limiter designed to provide high levels of transparency and instant visual feedback for a seamless workflow. It uses the design concepts and waveform display engine from Wave Observer to create a mixing and mastering tool for audio professionals and enthusiasts alike.

Main Features

  • Transparency. Precise true-peak detection, look-ahead audio analysis, and a 4x oversampled processing architecture allow you to preserve the natural character of your audio content, even at high gain reduction values.
  • Sound adjustment. Fine-tune the limiter settings to bring out the character you want or add a touch of saturation to handle peaks more aggressively.
  • Intuitive workflow. With a large input signal display, a gain reduction scope, true-peak level meters, and an automatically zoom-adjusted output waveform you can effortlessly configure all limiter parameters and visually evaluate results in real-time.

  • Gain control. Adjust the input gain to drive the limiter at a desired threshold level and control the output gain using two different modes. You can choose between a manual compensation mode or target peak-level normalization.

  • Customization. Choose from a range of color schemes and window sizes to suit your style and create a personalized workspace.

Northern Trumpets
by VG Trumpet
Trumpet, Brass, Jazz Instruments, Kontakt, Kontakt Instrument, Muted Trumpet, Orchestral
Soundware for: Kontakt, NKI, WAV 24-Bit
Northern Trumpets

Northern Trumpets is a jazz trumpet sound library for the Kontakt sampler platform (full version).

I created this instrument drawing inspiration from the mesmerizing trumpet sounds of renowned Norwegian musicians Nils Petter Molvaer and Arve Henriksen.

I didn't replicate their sound; instead, I aimed to capture the ambiance by blending warmth and coolness, mastery and spontaneity, and the tension of the notes with a relaxed perception.

The attack, the initial sound of each note, plays a vital role in this instrument. It may seem unpredictable, much like a trumpet player-musician just starting their career. Yet, it also serves as a powerful expressive technique in the hands of a seasoned musician, who can convey a wealth of emotions with just a few notes.

One of the secrets to effectively using Northern Trumpets is that the precision of the attack depends on the velocity with which you strike the key on your MIDI keyboard. The attack becomes more unpredictable when playing soft notes at a slow tempo.

A little backstory: I was born in Russia, where winter stretches for half a year. I've been beyond the Arctic Circle, where temperatures of -40 degrees Celsius are the norm, and I vividly remember how the trumpet mouthpiece would freeze to my lips. And while I began working on this project in sunny Bulgaria and completed it in the scorching heat of Barcelona, I felt a profound connection to the North and its perpetual frost.

I invite you to play a few sustained notes and experience the mood of the Northern Trumpets. I hope you find it as inspiring as I do.

These are its main characteristics:

  • The library includes two sets of samples:
    1. Open sound without a mute.
    2. Sound with the use of a Harmon mute:
  • Set up to work with breath controllers (TEControl, MRT Audio, Yamaha BC3), wind controllers (Robkoo R1, AKAI EWI, Yamaha WX5 / WX7, Aerophone AE-10, AE-20, Pro AE-30) and MIDI keyboard controllers.
  • More than 600 unique samples.
  • Northern Trumpets library requires the full retail version of Kontakt 5.6.8 or later (Kontakt Player is not supported).
  • Recorded sample quality: 24-bit / 48 kHz.
  • Custom designed, unique GUI.
  • Aftertouch, Mod Wheel, and Keyswitches are the key features to morph and perform sounds while playing.
  • Expressive Effects: Vibrato, Growl, Expression, Attack, Noise.
  • Articulations: Falls, Squeezes, Soft attack, Accented attack, Half valve.
  • Reverb, delay and stereo control to fit the trumpet in every mix.
  • Library Size: 1.10 GB.
  • Up to 7 velocity layers per key.

Special thanks to Frank Achtergarde for the idea behind this instrument, Alexandra Galaktionova for the outstanding visual design, and Julia Godzikovskaya for her assistance and support.






Northern Trumpets can be downloaded from my website as well as via KVR. Please feel free to contact me for any questions and feedback.

by Kirsty Roland
Visual Plugin Development Software, Save As VST

SynthCraft is a Visual Plugin Developer Program used for making audio plugins.

Create a project by choosing from a selection of Pre-Compiled modules and connecting them together with virtual patch cables. If you have used programs like this before you will feel right at home with SynthCraft.


  • Pre-Compiled DSP modules.
  • Simple drag and drop cable management.
  • Per sample DSP processing.
  • Easy to learn editor.
  • No complicated menu diving.
  • Dynamic menu system only displays relevant options.
  • Mouse driven interface.
  • Custom graphic interface designer for end user plugins.
  • Built in high speed DSP/C Compiler (c) Kirsty Roland 2019-2024.
  • Compile to native 32/64-bit binary. No plugin wrapper needed.

SynthCraft will be constantly developed and updated with lots of new modules and features in future and made available on my blog.

(c) Kirsty Roland

Black And Blue Basses
by Karoryfer
Bass Guitar
Soundware for: sforzando, SFZ/WAV
Black And Blue Basses

Black And Blue Basses is a sample library of two 5-string bass guitars: a black hollowbody played with the fingers, and a blue solidbody played with a pick. Over 2000 samples adding up to more than a gigabyte.

Key features:

  • Black bass has plucks, ghost notes, staccato, two types of behind-the-bridge picking and release noises, all with four round robins.
  • Black bass plucks have four velocity layers and ghost notes two velocity layers.
  • Blue bass has picked notes with two velocity layers, with eight round robins in the top layer and four in the bottom layer.
  • Blue bass also has extended low range to low E an octave below a standard 4-string bass's lowest note.
  • Simulated vibrato with humanization.
  • Swell and tremolo controls.
  • Synthesizer-style filter with resonance and modulation by LFO and envelope.
  • Unison with controllable width.

Walkthrough: YouTube.com/watch?v=hcI9ftmKn6Y

by Callybeat
Equalizer, effector, EQ

ForkHz is a parametric equalizer and effector with modulation options of up to 64 steps.

ForkHz goes beyond a simple equalizer due to the possibility of creating step modulations in filters, bands, gain and pan. This opens up the possibility of experimenting in a very agile way without the complex of confusing and tedious setups for the modern musician. Headphone equalization is also included to easily adjust the frequency responses to optimize them. More models and brands will be added with each update:

  • Experiment creating bursts of treble.
  • Extreme panning with surround dynamics.
  • Energizing and dynamic pumps by adjusting the gain.
  • Slowly moves a filter while there are panning shots and rampant gain bouncing around.
  • Be as creative as ForkHz allows you.

Main features:

  • 10 useful bands to make adjustments in the mix.
  • 1 low pass filter.
  • 1 Low Shelf pass-through filter.
  • 1 high pass filter.
  • 1 low shelf filter.
  • Modulation available up to 64 steps.
  • Step modulation available in 5 bands.
  • Step modulation available in Low Pass.
  • Step modulation available on Hi Pass.
  • Step modulation available in Gain.
  • Step modulation available in Pan.
  • Signal output in mono or stereo.
  • Zoom to resize ForkHz.
  • More than 80 presets ready to experiment.
  • Available only in VST 64 and VST3 format.


Turbo Paco

Turbo Paco is an old-style Algorithmic Reverb, based on some own and other classic algorithms reverse engineered and posted by the user "Acreil" on this forum thread.

This Effect is mostly about Allpass loop and Feedforward-Comb reverbs, with some few exceptions. There are some Choruses as a bonus.

The controls are pretty much self-explanatory except "Dyn Time" and "Op Range". When "Dyn Time" is positive the dynamics processor does ducking. When it's negative it does inverse ducking, which results in a kind of gate. "Op Range" is the level at which the hard clipper will clip the input signal. This is necessary for controlling the dynamic range of the fixed-point implementation.

The design philosophy is to have a limited set of controls and many algorithms. Now there aren't a lot, but more can be added.

The algorithms are implemented on:

  • 16-bit fixed point delay lines with noise shaping with a 32-bit accumulator for computation.
  • 16-bit custom-format floating point encoding delay lines with single precision floating point computation.
  • Single precision floating point (32-bit).

The rate of the the sample rate converter can be changed between to some preset frequencies, some "overclocked" and others "underclocked". Corollary of that, this effect runs at fixed sample rate, so it sounds the *same on all project sample rates.

The reverb is block processed and some algorithms use low sample rates, hence some of the algorithms are very CPU friendly.

My own algorithms are rookie stuff. Doing reverb is complex. I tried my best for them to sound acceptable. On the algorithm dropdown the algorithms prefixed with "AC" come from the user "Acreil" on gearspace. Those with no prefix are mine.

Thanks to all fellas on KVR's DSP forum for the guidance :).


PS: No Mac as I have no machine to test and I have never developed for it, but as this uses JUCE and CMake for building it may happen that it compiles for Mac out of the box.

SpatStrument SM24
by Acousmodules
Spatial Audio Synthesizer and Sampler, Multichannel, Sampler/Sample Player, Spatial + Panner, Spatial Processor
SpatStrument SM24

It's not an effect, it's not a synthesizer, it's not a sampler, it's not a 3D panner, it's not a controller... but it is all of this: it is the SpatStrument SM24;-).

Spatialization of sound with "3D panner" type tools is now a common and easy thing, and the popularization of spatial audio with Dolby Atmos and ambisonic technique makes it almost fashionable.
But considering a loudspeaker space as a concrete dimension of sound which can be modeled in a global way still remains the task of kind of "hackers", most often requiring specialized and somewhat complex environments.

Thanks to the recent expansion of MPE gesture controllers (my first one was the LinnStrument...), this SpatStrument should make it possible to approach audio-spatial sculpting in a playful and creative way, whether it is done inside standardized broadcast formats or in the freedom of original creations.

This plugin may interest firstly people who play electronic and electroacoustic live music, but also those who compose in multichannel studios to create fixed media works for domes, cinema, acousmoniums or whatever they like, with ambisonics or even binaural with the appropriate convertors.

Fortunately, it can also work in stereo with an ordinary keyboard with still enough features to play with sounds in innovative ways;-).


  • Up to 24 output channels with totally free speakers arrangement in 2D or 3D space.
  • Periphonic Spatial Mode to simplify the use with surround / immersive common formats (domes, Atmos-like 7.1.4, 9.1.6, 11.1.8, NHK 22.2...).
  • Volumetric Spatial Mode for advanced spatial creation and true 3D speakers arrangements.
  • 8 MPE polyphony voices with direct 3D spatialization with each finger.
  • Shape based spatial synthesis (Rings, Lines, Cube, Chaos) that can be combined and animated with different modulators and synchronized with sampling and synthesis parameters.
  • No including ambisonics and binaural processing: just use the converters you prefer (IEM and SPARTA are free and among the bests, special configuration files are provided for them).
  • Can also work in stereo;-).
  • Input Live processing: play a hardware or software instrument through it to add spatialization and effects, together with additional filter and envelope; spatialize a track content with a MPE controller; use the audio input level to modulate sound and space parameters (Envelope Follower).
  • Ring Modulation between the Live Input and the Sampler or the Synthesis.
  • Sampler: sample the audio Input or load an audio file; play it through a multimode filter, with its ADSR and LFO; control the Start and Loop points of the 8 polyphony voices independently with the fingers.
  • Synthesizer: 3 oscillators subtractive principle with FM, Synchro, multimode Filter and wide range ADSR and LFO modulations (it may not be well suited to play scaled melodies...).
  • Global MPE Modulations: use the X, Y, Z fingers positions, their distance and angle from the center to modulate every sampler and synthesizer parameters polyphonically.
  • Cross Modulation between the sampling and the synthesis sections.
  • Octo FX: 8 channels Delay/Resonator and Hall Reverberation (Freeverb in Mac version).
  • Alternative Triggers: ClockTrigger and VeloPad, for granular like effects (experimental...); they can also send MIDI Notes to other devices if the host allows it.
  • All parameters in one screen: What You See Is What You Generate.


- Screen size 1080p minimum
- Windows all versions
- MacOS minimum 10.15, Intel or Rosetta.
- A VST3 host that can use multichannel plugins.
The ideal is to have multichannel busses (Reaper, Ardour, Pyramix...) or to allow to connect freely inputs and outputs (Bidule, Element, Max/Msp, Usine Hollyhock, VSTHost...), but some stereo only DAWs can nevertheless distribute a multichannel output on several stereo busses (Live, FLStudio, Studio One, Waveform ...).
Note that it will not currently work with Steinberg's products.
- Optional but highly desirable: a MPE controller with enough physical space, sensitivity and accuracy for up to eight XYZ fingers movements (Sensel Morph is ideal...).

User Guide, Presets, additional files and video tutorials are available on the site page, and will be regularly updated: http://acousmodules.free.fr/spatstrument.htm

july-27: projects templates for Reaper, Live, Ardour, Logic Pro, Samplitude, Usine Hollyhock...

The SpatStrument is made with the 1.5 beta version of SynthEdit, and uses also the beta version of Elena Design's sampling framework, without whom this plugin could not exist.
Also with the modules from Davidson Audio & Multimedia, RoyTech, Sacha, Rob Herder, Time Domain.

Known issues:
- some graphic elements can flicker with some computers and graphic cards
- although not designed for real-time loop point modulations, the sampling framework performs generally well... however clicks may appear
- Mac: in MPE Mode Notes and Pitch parameters are currently merged; Import/Export of Spatial Configuration Files doesn't work; Area Shape cannot be changed; in some cases the UI can be unresponsive when loading a Preset with a Sample in Reaper; MPE efficiency modes is not available

See the Changelog on the site (to know your version: right click on an empty space of the plugin).


Alien Step Mutha
by Witch Pig
Multi-FX Step Sequencer, Bitcrusher, Chorus, Distortion, Flanger, Modulation, Saturation, Tremelo
Alien Step Mutha

Alien Step Mutha is an out of this world multi-FX step sequencer.

Drag above or below the baby aliens to shift through a galaxy of noise. Click on the mummy alien to open up the eyeball controls. From there you can select your drive speed through space, set the FX mode, and ultimately open up a whole new universe of intergalactic aural soundscapes.




by XiiixxiQ
Euclidean MIDI Sequencer

Euclidean, Non Linear, Poly-metric, Polyrhythmic, Morph-able Step Sequencer

Roundels is uniquely based on summing the output of multiple Euclidean rhythm generators to produce new, hybrid rhythmic structures that feature both internal, small scale variation in addition to larger scale repetition. This, in combination with the natural variation provided by using the resultant poly-rhythms to drive a (non-fixed length) step sequencer, that can treat a sequence of notes as a Schoenbergian 'pitch row' or Fortean 'set', creates the possibility for effortless experimentation without resorting to stochastic intervention, thus giving the user ultimate choice in the direction of their music, and therefore ultimate control. The output of each of the Euclidean rhythm generators can be targeted to affect just the movement of the step sequencer (with no rhythmic trigger), to produce just a rhythmic trigger with no effect on changing the step sequencer's position, or to affect both.

The step sequence of pitches can also be manipulated under transformational functions such as transposition, retrograde progression, intervallic inversion, diminution, and expansion, in addition to the standard re-ordering available in most sequencers of this type - backwards, forwards and ping-pong playback. It also includes variation of the step-size.

Roundels frees your sequences from being tied to the conventional timeline of a DAW's sequencer. It can operate over any length of pulses and, using the external trigger function, can act in any time-world as it responds to MIDI note-on messages rather than clock pulses.

Roundels also features a unique sequence-morph function that brings together three discrete (user-generated) sequencer patches as one entity. This can be used manually, it can be auto- animated, or it can be controlled via your DAW's automation.

Roundels now gives the user the ability to form a komplex of inter-related rhythmic subsets ensuring there can be a level of hierachy and organisation imposed when using the Euclidean sequencer.

Roundels is designed to function as a MIDIFX plugin in Logic.


Pitch Sequencer (1 - 21 steps):

  • Full 10 octave range per step.
  • Piano roll view for 1 and 2 octave range.
  • Multiple step patterns and pathways.
  • Per-step Mute and per-step Kill option.
  • Per-step Legato or per-step Ratchet function (each independently loop-able).
  • Total Sequence transpose (+/- 3 octaves).
  • Total Sequence pitch inversion (selectable inversion point).
  • Total Sequence compress or expand pitch range (selectable target pitch, + and - 1 octave down to single target pitch).
  • Chromatic Quantiser.

Independent Velocity Sequencer (1 - 8 steps):

  • Blend velocity with MIDI input function.
  • Compress velocity levels.
  • Swing function.
  • Adjustable gate length.
  • Humaniser.

Four independent, identical, Euclidean Rhythm Generators:

  • Summed output to step sequencer.
  • Selectable trigger function (off, pitch only, rhythm only, pitch & rhythm).
  • Adjustable length in pulses/beats - (1 - 34 pulses).
  • Adjustable triggers/steps - (1 - 33 triggers).
  • Rotate rhythm function (1 - 33 pulses).
  • Reverse rhythm function.
  • Invert rhythm function.
  • Half-speed function (x 16).

Output Viewer:

  • Rhythm and pitch-stream time-line viewer.
  • Adjustable range (2 – 96 x 16ths, 128, 192, 256 and 384 x 16ths).

Hard looping:

  • Entire sequence can be reset after a selectable length of pulses (1 - 96 x 16ths).

Sequence Morph:

  • Three independent sequence patches can be morphed together over time as smoothly as possible.
  • Morph can be manual, auto-animated, or controlled via automation.

Parameter Randomisation:

  • Individual sequences can be generated randomly.
  • Option to auto-generate a set of three random yet closely related roundels as a starting point.

  • Selectable targeting to randomise just the pitch content, the rhythmic elements, the sequencer settings, or all at once.

Single Sequence Usage:

  • All functions available to Automation.
  • Saving of presets via host application.
  • Sequencer is locked to host tempo 16ths BUT can be triggered by any stream of incoming MIDI Note Ons.
  • Using any tuplet pulse will result in poly-metric playback against that of the DAW in External mode.
  • Calculation of Lowest Common Multiple (in 16ths) for aggregated Euclidean rhythms.
  • Calculation of Lowest Common Multiple (in 16ths) for aggregated Euclidean rhythms and pitch sequence.
  • Selectable visual representation of summed Euclidean sequencers and pitch - (1 to 256 x 16ths).

Advanced Settings

Internal Sequencer:

  • Syncs with host tempo.

the following functions have been temporarily disabled whilst be re-developed

External Trigger::

  • Next-step triggered by incoming MIDI Note On.

FX Only::

  • Sequencer and velocity effects will act on incoming MIDI notes.
  • Quantiser, transpose, compress, invert, humanise, gate length, swing, velocity sequencer also active.

Add CC::

  • Sequencer can be used to merge a MIDI CC track with incoming MIDI notes.
  • Sequencer function operates broadly as it would generating pitch-content.

Arpeggiator 1::

  • Arpeggiator function transposing the entire sequence via incoming MIDI notes (in relation to Pitch 1).

Arpeggiator 2::

  • Spreads incoming chords out and sequences them according to user-settings of pitch sequencer and Euclidean rhythm generators.

[ Updated (04-07-23) Roundels version 1.0.1 ]:

  • New Universal Binary for Intel and Apple Silicon - AU.
  • Fixed some routines to lower overall CPU load.

[ Updated (13-07-23) Roundels version 1.0.2 ]:

  • New Universal Binary for Intel and Apple Silicon - AU / VST3 / LV2.
  • VST3 tested in REAPER 6.81.
  • Fixed some more routines to lower overall CPU load.

[ Updated (25-09-23) Roundels version 1.2.0 ]:

  • Re-written MIDI clock/trigger.
  • Some Advanced functions temporarily disabled for redevelopment.
  • Subset / Komplex page added.


by Psytrance Plugins
TranceGate, Gate, Gator, Samplur PROgate, sequence, Stepper, Trance

Samplur PROGate is a Trancegate of 2 channels with 32 steps each.

The user can use just one channel that will affect both L/R or use 2 channels, one for L another for R.

Featuring per channel:

  • Gate mode.
  • 32 steps.
  • Pulse.
  • Swing.
  • Attack.
  • Release.
  • State Variable Filter (Cut/Res).
  • Gain Control.
  • 4 LFOs/ENV (Cut/Res/Attack/Release).
  • possibility to save/load LFOs waveforms.


  • Master Stereo Delay.
  • Master Chorus.
  • Master Reverb.
  • Stutter Button (create freezing and stuttering).

The plugin is distributed for Windows 10/11 VST2/VST3 64-bits and Mac OS X AU/VST3 64-bits (running on Catalina 10.15 or better and Apple Silicon ARM processors M1/M2.

The Mac OS X version does not need to be code signed or notarized. The installer will do that automatically.

There are Portable Versions in the package if you do not want to use the installers.

Any question contact: psytranceplugins@outlook.com

by ZonderP Productions
VST2 plugin wrapper, VST2 plugin preset managment system

VeeSTeeEx is a Windows only wrapper for VST2 plugins, which adds a preset management system to the wrapped plugin.

It uses a SQLite database to store all imported presets, which then can very quickly be selected for usage within the wrapped plugin.

There is tagging by some built-in tag groups and tags, but is is also possible to define own tag groups and tags. And there is also the possibility to rate presets and to quickly find presets by name with a simple search. This tagging/rating/searching can be used in combination to do enhanced filtering.

The preset files ('.VeeSTeeExPresets') can be shared.

By default there will be an area above the wrapped plugin, which gives access to the presets and also allows to step thru them.

How this top area looks like can be changed by editing the xml 'GUI' file of the wrapper for each wrapped plugin individually.

Those GUI files could be shared too.

Version - 2024-06-03:

Most important new features and improvements:

  • Switch between light and dark mode.
  • Change transparency of the Preset Picker.
  • Color mode and transparency as well as some other options are now persistent - color mode globally, transparency and others per wrapped VST plugin.
  • Customize key mappings (keyboard shortcuts) for commands - persistent per host/DAW.
  • Quick save and quick import of internal presets (by default enabled only for VST plugins with no internal bank).
  • Number of presets in banks are now shown when option 'Show counters?' is checked.
  • Banks and authors can now be rated.
  • Banks and authors can now be sorted.
  • Search boxes (e.g. in 'Simple search') now have a cancel button companion.
  • ...

See some more changes/improvements/fixes in the Change Log.

Preview for next VeeSTeeEx version:

  • MIDI Keyboard.
  • Virtual banks (maybe).
  • Preset generator (1st iteration - maybe).
  • ... this and that....
by lkjb

BassTame does what its name suggests. It compresses the bass to get a more defined overall sound. As it weighs the bass amplitude in reference to the non-bass amplitude it works level independent. Simply dial in the amount and crossover frequency to be done.

by Jade Hochschule
Modulation Filter, Equalizer, MIDI, Sound Design, Vocoder

The name EQoder is a wordplay between EQ and Vocoder, since you have to use it like a vocoder but the effect is a modulated cascaded Equalizer. In its resulting function it is an amplifying comb-filter.

The fundamental frequency of each unit/voice is controlled by MIDI notes. Thus, in order to use the effect, you need a MIDI input (or the internal keyboard).

The internal harmonic structure of the comb filter can be adjusted with several parameters.

In order to work with EQoder you route it as an insert filter after an arbitrary audio source (e.g. a synthesizer). Since DAWs are very different in routing insert effects with MIDI please refer to the manual of your DAW.

You can use EQoder as a sound design tool or a melodic extension in your composition. Think of EQoder as a tool to play a second melody on the harmonic structure of your original sound, or as a further modulation source for each note of your favorite sound.

Source Code is available at github.com/JoergBitzer/EQoder

Video to explain the parameter: YouTube/rzgiGkhC728

Video to show, how to use EQoder for sound design: YouTube/IySXj8C7AzU


AFEQ is an EQ using and demonstrating the use of the AudioFilter library. The plugin is made with JUCE.

It features:

  • 12 bands.
  • Frequency analyser.
  • Routing per band.
  • 2nd order ("normal") peak / shelf / cut filters.
  • Butterworth cut, shelf and bandshelf filters with orders between 6 and 48 dB/oct.
  • glitch-free varying of band parameters.
  • except for bandshelfs no (or at least little) frequency cramping towards nyquist.

Source code is available on GitHub.

by Flandersh Tech
Multi Band, Doubler, EQ, Pan, Pitch Shifter

MShift8 is a 8 band pitch shifter and doubler with a special mode for vocals (V-button).


  • 8 Band Pitch Shift and Doubler.
  • Special Vocal Pitch Mode.
  • Pan and Gain Control on each band.
  • Band defined by Note values.
  • Dry/Wet knob.
T.Rex 220E
by Max Project
Drum Machine, Classic Drum Machine, Drum Kits, Drums, Vintage Drum Machine
T.Rex 220E

T.Rex 220E is the new virtual instrument from Max Project.

It consists of 12 drum sounds highest quality.

3 classic rhythms called "InstntBeats" & 3 classic basslines called "InstntBass" that allow you to quickly generate ideas or use them as accompaniment with some other instrument.

Main features:

  • 12 Drum Sounds.
  • Pitch & volume controls per drum piece.
  • 3 Classics Rhythms (InstntBeats).
  • 3 Classics Basslines (InstntBass).
  • Master volume control.
  • Integrated reverb.
  • Integrated delay.
  • Integrated chorus.
  • Integrated distortion.
  • Vintage-Modern looking GUI.
  • Low CPU usage.

System Requirements:

  • Windows (Vista, 7, 8.1 10 and 11) or macOS 10.14 and later.
  • VST2-VST3 compatible DAW hosting software in Windows.
  • Audio Units - VST2 & VST3 for macOS.
by Midi Mobiles
Sampler (Loop Tool / Slicer), Bitcrusher, Delay, EQ, Flanger, FX Engine, Glitch Bundle, Pitch Shift, Randomizer, Reverb, ROMpler, Saturate, Slicer
Soundware for: SF2, sfz, WAV

HyperStonik is a ROMpler with some delirious FX. (very strange effect ...). He succeeds his elder SloTone (KVRDC18).

We can use it with 2 modes: Instrument or Loop mode. No need to MIDIfiles. Some OSCillator generate the beats. (You can compile some new instrument with a separate software not delivery in the preset package). You just need a .wav file (a loop) and with some appropriate setting, you can attach text file with it (in the same repertory) and save the slice config (file text with the same name of the sound).

A soundware is incorporate in the project.

You can compil your own instruments to use it with HyperStoniK. for more infos, come to my KVR forum Support :


This is the links to download the complete package:

  • StoniK_[v.0.23].rar (1.20 Go compressed and 2.71 Go uncompressed including 2.55 Go of sound and the software HyperStoniK).
  • HyperStoniK_V.0.23.rar (39 Mo compressed and 121 Mo) uncompressed including the update of HyperStoniK VST2 & VST3 with updated templates).
  • StoniK_SF2_[v.0.23].rar (0.98 Go compressed and 2.40 Go) : New SF2 package to lighten the basic package...

It is recommanded to merge the uncompressed [STONIK_Soundbanks] of StoniK_SF2_[v.0.23].rar with


to put the additionnal sounds on the good repertory...

And the documentation with 3 pdf : Getting Start.pdf (Installation, 1st load & sound modification), User Manual (for english readers - Work in progress), Mode d'emploi (pour les francophones - En cours d'écriture, de plus en plus étoffé au fil des mises à jour...):







by Fanan Team
Bass slide generator, Bass Slides, Bass Synthesiser

Moaner is a bass synth equipped with a 7 bass models engine that easily solves the need of bass slide hit in your track. Unlike other bass slides solutions, Moaner matches the slide to your track's time signature and tempo to instantly achieve the most accurate bass slide that matches you track.

How It Works

Moaner divides the notes scale into 3 zones: the lower zone slides the bass note down (pitchband from middle to zero), the middle zone slides it up (pitchband from middle to 1) and the higher zone plays the bass regularly. You can control each zone's octave, pitchband range and BPM separately and also sync the BPM to your D.A.W.

Noizier - A Simple Noise Generator
by Michael Hurst
Noise Generator, LV2, SFX, Sound Design, Synth, VST 3
Noizier - A Simple Noise Generator

Noizier - A Simple Noise Generator

Noizier is an Audio Plugin created to generate noise sounds quick and easily with a selected range of modulators to shape the sound.

How to use:

  • Play MIDI notes to generate the sound.
  • Noise type: Can be changed by using the dropdown menu.
  • Currently there are 3 Noise types:
    • White Noise.
    • Pink Noise.
    • Comb-ish Noise (Sounds a bit like applying a comb filter, hence the name).
  • ADSR Panel: Change the envelope of the Notes.
  • LFO Button: Turn on LFO Amplitude Modulation and change the Frequency with the dial.
  • HPF and LPF dials: Can be used to apply a highpass and lowpass filter (fixed 36db per octave slope each).
  • Keytrack button: Enables a fake pitch mode. Here, a lowpass filter is applied to the signal depending on the note you are playing. Ranges from C0 to C7.

How to install

  • Windows: Use the installer or copy Noizier.vst3 to C:\Program Files\Common Files\VST3.
  • Linux: Copy Noizier.lv2 folder to your LV2 Plugins Folder.


The code for this project has code adaptions based on the JUCE Documentation and Tutorials (docs.juce.com/master/index.html) and Joshua Hodge aka The Audio Programmer (github.com/TheAudioProgrammer/).


Noizier is released under the GNU General Public Licence v3 or later (GPL-3.0-or-later). The license is found in the "LICENSE" file in the root of this repository, or at gnu.org/licenses/gpl-3.0.en.html


Appressor (Uppressor) is an Audio VST-3 Plugin that enhances the clarity of an audio signal. It works better with a moderate input signal (less than -4 dBFS). A simplistic GUI follows my function-over-form approach.

(All Rights Deserved).


Subsim is a web-based subwoofer array simulator. It is a simple visualisation tool showing an approximation of how sound at a given frequency coming from multiple sources will propagate through space and what interferences will arise. It is meant to help engineers learn about basic principles of subwoofer array design, while giving them a free hand to try out their own ideas and inventions.

There is a couple of predefined projects you can go through to see both some of the aforementioned basic principles and some of the features of the tool. Here are some highlights:

  • Web-based, no download or installation required. Mobile friendly.
  • Highly optimised engine allows for near-instantaneous rendering. No more setting a target frequency, pressing a button and going to get a coffee.
  • (Almost) fully parametric - all numeric parameters can use mathematical expressions and these expressions can contain user-defined variables.
  • Visualisation of arrival times from different sources at a given point in space.
  • Rudimentary support for first reflections.
  • Adjustable dynamic range and step. Get a beautiful (but not as useful) gradient-like image, or a slightly less beautiful (but much more useful) isobaric prediction of areas with similar SPL.
  • Export to JPG and PNG (with or without UI elements).
  • Save projects in the browser, or export them to a simple text file you can share with others.
  • Free and open source.

Rules, Information, Guidelines, etc.

Show/Hide Rules

Any operating system, any plugin format, a stand-alone application, a sound library - anything that will assist in music making goes! You have three months to get it together - submissions will end on June 30th, 2023. They will all then be hosted for download on the KVR server and released "AT ONCE" for public appraisal and voting!

Although anything goes, you should consider how to appeal to the largest market - things such as open source or being multi-platform may garner a bigger audience, and consequently more votes. This is your call though. Whatever you are comfortable with!

The Basics:

  • Anyone may enter.
  • Your entry must be an original creation made by you (your team / crew / company / family). Of course you may reuse code / modules / development frameworks, but the actual plugin / application / sound library should be a new, original creation, not just an obviously cut-down subset of a program you have already written.
  • Your entry must not break any copyright rules or license agreements - if your entry uses GPL code then your code should adhere to any restrictions imposed by this, for example.
  • Your entry must not be restricted in any way that could make it appear to be a demo / trial version for a subsequent "full" release. i.e. It must not be save-disabled or beep every few seconds or nag the user to donate / pay, etc. Your entry should be fully functioning and remain fully functioning forever.
  • Your entry may support any operating system(s) in general use for making music: Windows, Mac OS X, Linux, iOS or Android.
  • Your entry may support any plugin format, or be a stand alone application / utility, or be a sound / sample library.
  • You may use any programming language or development environment (e.g. programming languages such as C++, Delphi, Java, etc. or any of the myriad development applications such as SynthEdit, Flowstone, Max, etc.).
  • Design and testing must be done in private - public beta testing is not allowed as this may affect the voting process.
  • During the voting period you may update your entry but updates must be bug fixes ONLY. You are NOT allowed to add new features or rework existing ones during the voting period.
  • You grant KVRaudio.com the permission to distribute your entry for download via our server from July 3rd, 2023, onwards.
  • You grant KVRaudio.com the permission to act on your behalf, without monetary involvement, for your entry to be published and/or publicized in/on written publications with or without accompanied media such as CDs and DVDs, as well as online publications. You may choose to opt out via a written (email) disapproval of such permission at the time of your entry. KVRaudio.com will not seek or make attempts at financial gain by promoting your entries on written or online publications.

How To Enter:

  • To enter you will need a KVR Developer Account [get one here - it's free]. If you already manage your products and submit news directly at KVR, you will already have one.
  • Access the Developer Control area and add your entry as a new product but remember to also set the KVRDC23 flag. Anything flagged as KVRDC23 will NOT be made live on KVR until the KVRDC23 go live date of July 3rd, 2023.


  • KVR Members will vote for their favourite entries between July 3rd-31st, 2023. Depending on the amount of submissions, the voting period (and consequently the winner announcement date) may be extended for another week or so. All KVR members will be eligible to vote although we may instigate some restrictions at the time of voting - maximum joined date, minimum number of posts, etc. - to help prevent voter fraud.
  • Voting will be in the form of selecting a top 5:
    • 1st choice will be awarded 5 points.
    • 2nd choice will be awarded 4 points.
    • 3rd choice will be awarded 3 points.
    • 4th choice will be awarded 2 points.
    • 5th choice will be awarded 1 point.
  • The winners will be announced on August 3rd, 2023.
  • The prize fund will be delivered to the winners (or charity or recipient of the winners' choices) via PayPal within a week of the winner being announced.

The Prize Fund (Money Money Money)

  • The prize will be cold, hard, cash, made up from donations from the KVR community. Donations can be made via PayPal and will be held in escrow by KVR Audio until the winner has been selected. The prize will be paid to the eventual winner via PayPal. We'll endeavor to keep the prize fund total updated here.
  • The prize fund will be split:
    • 30% to the Windows Plugin or Standalone Application entry with the most votes 1, 2
    • 30% to the macOS Plugin or Standalone Application entry with the most votes 1, 2
    • 20% to the next highest placed entry
    • 10% to the highest placed Soundware entry
    • 10% to a wild card random selection
  • Additional prizes, donated by fellow developers, will also be available and distributed on an ad-hoc basis. If you wish to donate something please contact contactus@kvraudio.com

1 These can be the same entry. If it is multi-format and gets the most votes the entrant would receive 60% of the prize fund.

2 Yes we know Linux (and other OS) appears to be overlooked but the Linux (and other OS) userbase at KVR is very small so we'll concentrate prize distribution on the two major Operating Systems for audio production - Windows and Mac OS X. However, in the event of the unlikely situation that the entry with the most votes is for Linux (or another OS) only it will be awarded 30% of the prize fund and the next 40% will be split between the highest placed Windows and Mac OS X entries (20% each) and the "next highest placed entry" will receive 10% instead of 20%.

Good Luck!