Product Reviews by KVR Members

The KA-303 sounds exceptionally good and powerful, even in the bass. The controls are easy to use and operate very smoothly. The graphical user interface (GUI) can be scaled smoothly and continuously. Sonically, the KA-303 performs at the highest level, offering advanced sound and rhythm manipulation capabilities.

Many Acid House and Acid Techno presets are already available. The sound can also be modified with various presets, ranging from Classic Acid and Muffled Groove to Unison Fat. The advanced composing engine is a unique feature of Kreuzberg Audio, offering a wide range of settings, including scale, pattern, rhythm, accent, jump, unit, and slide. Users can also draw directly on the graphical interface using the mouse.

For fans of the legendary 303 sound, this instrument is a clear recommendation – it's state-of-the-art and worth every penny.

The WaveWarden - Spline - Short Review

As a thank you for this outstanding virtual synthesizer, I've created a free sound set. The Spline pleasantly surprised me; it's rare to see such a beautiful, useful, and easy-to-read graphical user interface (GUI). Then there are the new possibilities for creating new sounds.

The Spline Mode function, which allows you to easily draw all sorts of curves and shapes in the oscillator and filter, is truly a creative and useful invention for realizing new sonic possibilities. You can also load wavetables in the oscillator, the sound generator. The following morphing functions are available: Spectral Factor, Spectral Shift | Octaves | Spectral RNG, Spectral Perlin | Hard Clip, Soft Clip | Fold, Zero, Invert | FM 1:1, FM 1:2, FM 1:3 | Brick Wall LPF, Brick Wall HPF, Brick Wall BPF, PeakEQ | Sync, Phase Distortion.

The menu includes a zoom button to adjust the GUI size, a button to disable helpful tooltips, an INIT button to set a preset for your own sound design, a Show Manual button to access the comprehensive and beautifully designed manual, a Storage Path button for direct access to the hidden folder containing the presets, and an About button. Further sound processing options include four LFOs, four ADSR envelopes, an arpeggiator, enablements, and a modulation matrix.

Sonicbits - Silk Short Review (English).

The Silk sounds good and is available for little money 19 $ EUR.
The user interface (GUI) is exemplary and clearly designed.

All parameters and controls are very easy to use and easy to see. The Silk is also scalable for modern 4K monitors 80%, 90%, 100%, 110%, 125%, 150%, 175%, 200%.

The sharpness and color selection are very well done. A great GUI to my taste.

The manual can even be accessed via the interface in the system button, for beginners it is a well thought out virtual software synthesizer with 3 oscillators (2x saw and 1x noise), spread and blend function plus detune - 99 & + 99, range -24 & +24.

There are 7 filter types to choose from, even a 6 LP filter and formant filter with A E I O U has been thought of. The modulation envelope and the modulation matrix invite you to create new sounds.

With the 2 LFO low frequency oscillators you can create floating sounds and also rhythmic sound images. The 2 LFOs have sine, saw, square, triangle and S&H waveforms. The rate for the LFO is equipped with SYNC and FREE, which can be edited with the RATE function 0.01 Hz to 40.00 Hz and the DEPTH function 1 to 100.

The 3 effects chorus, delay and reverb sound good and give the sound more space and fullness.
There is a pitch wheel and a mod wheel function for your MIDI keyboard.

On October 11, 2005 the company Synthepolis enriched the world, with the nrg-A, a polyphonic analog virtual synthesizer. Sonically, it is a masterpiece and valuable in its sound to this day. Unfortunately the company disappeared and therefore nrg-A is only available in 32-bit and on the technical and graphical state from May 2006.

nrg-A architecture overview (from the nrg-A Manual):

The nrg-A is a virtual analog synthesizer. Generates sound by simulating the different
components of an analog synthesizer through physical modelling. nrg-A uses no samples, it just calculates the sound as you plays in accordance to the controls it receives. The result is an unique, quality, realism, warmth and dynamic sound character.

Waveform /VCO (Voltage Control Oscillator):

- Sine = Classic sine waveform
- Parsine = Parabol sine
- Triangle = Triangle waveform
- Triasine = SineTriangle combination waveform
- Saw = Sawtooth waveform
- Saw mg = Moogish Sawtooth waveform,
- Ramp = Ramp (inverted sawtooth) waveform
- Ramp mg = Moogish Ramp waveform
- Pulse = Square/Pulse waveform
- W.Noise = White Noise waveform
- P.Noise = Pink Noise waveform.

Filter / VCF (Voltage Control Filter):

- LP 36 db = Low Pass filter with 36 db/octave slope
- LP 24 db = Moogish Low Pass filter with 24 db/octave slope
- LP 12 db = Low Pass filter with 12 db/octave slope
- HP 12 db = High Pass filter with 12 db/octave slope
- BP 12 db = Band Pass filter with 12 db/octave slope
- BR 12 db = Band Reject (Notch) filter with 12 db/octave slope.

nrg-A features:

• Analogue subtractive synthesis.
• 16 voices / 384 patches.

• 3 VCOscillators each with 11 waves: sine, parsine, triangle, triasine,
saw, saw mg, ramp, ramp mg, pulse, white and pink noise.

• Pulse length control for every VCO.
• Phase control for VCOs 2 and 3.
• 3 Fm routes for VCOs: 3>2, 3>1, 2>1.
• 2 Sync routes for VCOs: 2>3, 1>2.
• Key retriger option for VCOs.
• Ring effect with 3 routes: VCOs 1*2, 1*3, 2*3.
• 1 VCFilter with 6 types: LP 36, 24 and 12 db, HP, BP and BR 12 db.
• Velocity and aftertouch for VCF frequency.
• VCF input hard clip and drive controls.
• VCF output soft distortion (saturation) control.
• VCF Fm with 6 sources: VCOs 1, 2, 3, 1+2, Ring, Mix.

• 3 adsr Envelope Generators: EG1 for VCAmplitude and via Matrix, with velocity to amount and attack control. EG2 for VCF freq and via Matrix, with 4 slope curves, inverse option and velocity to amount control. EG3 for 32 dedicated destinations and via Matrix, with 4 slope curves, inverse option and velocity to amount control.

• 3 Low Frequency Oscillators, each with 7 waves: sine, triangle, saw, ramp, square, white
and pink noise, full syncable to host tempo, retriger, s/h and wheel to amount
options, plus delay control for LFO1 and phase control for LFOs 2 and 3, plus 42
dedicated destinations and via Matrix for LFO1, 42 dedicated destinations and via Matrix
for LFO2 and 51 dedicated destinations and via Matrix for LFO3.

• Matrix modulation with 5 slots: 1) with 21 sources and 32 destinations, 2) with 21 sources
and 32 destinations, 3) with 19 sources and 42 destinations, 4) with 17 sources and 46
destinations, 5) with 15 sources and 51 destinations.

• Sequencer/gate unit with 16 steps, 2 modes, full syncable to host tempo, key retriger
option, step number selector, 16 notes selectors (4 octaves range), 16 on/off gates,
out to pitch option and to VCF freq control, gate to EG1 and to EG2,3 options with gate
length control.

• Stereo Delay, each channel is full syncable to host tempo and with time, feedback and
mix controls.

• Reverb unit with damp, width, size and mix controls.
• Equalizer 2 band: low and high +/- 6 db.
• Output 6 db high pass filter.
• Play mode selector: mono, mono with: last, high, low note priority, legato and poly mode.
• Portamento control, MIDI channel, transpose and pitch bend range selectors.