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RAPID Synthesizer

RAPID Synthesizer
RAPID Synthesizer RAPID Synthesizer RAPID Synthesizer RAPID Synthesizer RAPID Synthesizer RAPID Synthesizer RAPID Synthesizer RAPID Synthesizer RAPID Synthesizer
RAPID Synthesizer by Parawave Audio is a Virtual Instrument and a Virtual Effect Audio Plugin for macOS and Windows. It functions as a VST Plugin, an Audio Units Plugin and a VST 3 Plugin.
Windows 7 and later
CPU: Intel or AMD with SSE2
Memory: 4GB RAM
Storage: 3GB
Display: 1920×1080 and up
32-bit (x86)
64-bit (x64)
MacOS 10.13 (High Sierra) and later
MacOS 11,12,13 (Ventura) and later
Memory: 4GB RAM
Storage: 3GB
Display: 1920×1080 and up
Intel 64-bit (x64)
Apple Silicon (ARM64)
Sample Formats
Loads and/or Saves
Copy Protection
Online Activation (Challenge / Response)
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RAPID is a modern polyphonic hybrid synthesizer designed to bring together fast workflow and powerful synthesis techniques. The unique layer engine that powers RAPID lets you shape and customize all aspects of your sounds, resulting in dynamic and fat patches, ready for production, performance or simply inspiration.

With version 1.8.6 support for VST3 was added.

With version 1.8.5. the new effects Chorus X and Vintagizer have been added.

Since version 1.8.0. a new bonus sound package called Granular Elements is now included for free.

Since version 1.7.0. the additional plugin RAPID FX is included. This allows the use as an effect unit on DAW mixer, insert and send channels and opens up a whole new dimension of sound processing possibilities.

Each of the 8 synthesis layer can be controlled separately and consist of the following elements.


  • Morphable Wavetables.
  • Multi-Samples with Velocity and/or Round Robin.
  • Up to 8x Unison voices.
  • Bass and Treble control per waveform.
  • Tube Distortion and Asymmetric Clip.
  • Phase Modulation and Ring Modulation.
  • Phase & Ring Modulation from other Oscillators.
  • Phase Bend, Phase Double and Phase Mirror.
  • Phase Feedback Modulation.
  • Hard Synchronization and Sync Bend.
  • Formant Shift and Phase Overlap.
  • Organic Drift and Pulse-Width Modulator.
  • Chaos Phase and Noise Generator with smooth Brown/White/Pink fading.

Granular Synthesis:

  • Up to 100 true stereo grains.
  • Morphable grain envelope shapes.
  • Grain lengths from 10 milliseconds up to 1 second.
  • Chaos randomizer for grain position, rate, length volume and detune.
  • Can also use stereo Multi-Samples as granular source.
  • Free bonus library Granular Elements included.

Filter & Insert:

  • 6, 12, 24 dB Lowpass and Highpass.
  • 12, 24 dB Pro-Lowpass.
  • 12, 24 dB Bandpass and Peak.
  • 24 dB Multi-Bandpass and Multi-Peak.
  • 12 dB Notch and Multi-Notch.
  • Acid, Analog, Legacy, Vintage Lowpass.
  • Xtreme Lowpass I and II.
  • Formant, Vowel, Bitcrusher and Sample and Hold.
  • Feedback-Comb and Time-Lag.
  • Parallel and Serial Low/High-Pass combination.
  • Tube Distortion, Overdrive and Tone-Fuzz.
  • Exciter and Attack Booster.


  • 4x ADSR envelopes with adjustable slopes.
  • 4x LFOs with dual waveform and phase bending for complex shapes.
  • 4x Sequences with up to 32 steps, with loop and one-shot mode.
  • Different trigger modes for various use-cases.


  • 32-Step pattern steps with adjustable lengths.
  • Up, down, random, queue and chord pattern mode.
  • Octave and shuffle control.
  • Import/Export external MIDI files.


  • Legato mode with note glide.
  • MIDI channel filtering.
  • Key-range per layer.
  • Input note filter.
  • Reorder of insert and filter processing.


  • Reverb with 8 spatial models for different sizes.
  • Delay with smooth delay time modulation.
  • Dual Delay with Cross-Feedback and Ping-Pong mode.
  • Tonal Delay with tunable delay times.
  • Chamber for very short reverb acoustics.
  • Smooth Tube Distortion with dynamic EQ Boost.
  • Bit-Crusher, Rate-Reduction with Jitter.
  • 2-Band Waveshaper with adjustable crossover.
  • 4-Band Saturator with 16 different insert types.
  • Phaser, Flanger, Chorus with precise modulation depth control.
  • Ensemble Chorus.
  • Multi-Stage dual Chorus X.
  • 3-Band-Equalizer with low-pass, high-pass, low-shelf, high-shelf and bell filter.
  • Talker Filter 6 vocal formant modes and internal crusher.
  • Dynamic Compressor with Digital and Analog mode.
  • Syncable Sidechain leveler with different shapes.
  • 32-step stereo Trancegate with Shuffle-Rhytmn control.
  • Send Router, for parallel mixing with other layers.
  • Tapestop with adjustable slope, start and stope time.
  • Glitch for pitch shift, stutter and time jumps, controllable by sequences.
  • Vintagizer Retro and Lo-Fi emulation.


  • 8-Channel Mixer.
  • 3-Band Dynamic Compressor with different reaction models.
  • Output Limiter with automatic makeup gain.
  • Quick Modifier for simultaneous control of Volume and Filter Envelope for all layers.

User Libraries:

  • Single- & Multi-Cycle Wavetable import.
  • Single- & Multi-Sample import with Velocity & Round Robin.
  • Resynthesis Algorithm for new Multi-Sample generation.
  • Archive & Installation of self contained library bundles.


  • Drag & Drop Modulation.
  • Preset Files for Modulator, Effect or Arpeggiator pattern.
  • Copy & Paste Modulators, Patterns or complete layers.
  • 3-Macro Controllers.


  • Resizeable HD graphics with 16:9 resolution (1280 x 720 px).
  • 4K Ready and scalable up to 300% (3840 x 2160 px).
  • Ten unique UI Themes.

RAPID comes with a great variety of production ready sounds. Each preset designed and handcrafted for playability and creativity in mind, passed through careful quality control. All macros are linked to allow an easy control of the most striking sound aspect.


  • 660+ Sound Presets.
  • 250+ Wavetables.
  • 190+ Multi-Samples.
  • 370+ Oneshot Drum Samples (44.1 kHz, Stereo, 16-bit WAV).
  • 250+ Modulator Presets.
  • 250+ Arpeggiator Presets.
  • 510+ Effect Presets.
  • 110+ Rapid FX Presets.

Latest User Reviews

Average user rating of 4.80 from 5 reviews
RAPID Synthesizer

Reviewed By moonchunk [all]
December 11th, 2023
Version reviewed: on Windows

The appealing thing to me about this synth is the sound. Avenger and Rapid have similarities, but I find myself looking more forward to a session in Rapid because of the character of sound design that draws me into the controls. 3 Oscillators per layer (8 layers) the wavetable transitions are smooth as silk. But I'll be honest, the same reason I keep coming back to this is the reason I keep being fascinated by U-he's work. The nuance behind the programming makes each synth different. It's hard to say what makes the oscillators and filters do what they do. Rapid has a "drift" thing you can turn on, like Syntronik 2. But even without it the organic righteousness of the lows & mids throb & hum beautifully, and the brilliant sheen on top is so pronounced that I can't help but think there's some proper, well thought out sound processing behind it that is being caught up to by Avenger v2 no doubt. I would like to only pay for one - like I would like to pay for only 1 $250,000 sports car. But when I demo'd Rapid I could tell these are very different animals. The new features of Avenger 2 make me glad to have that, but there are some patches in Rapid that are completely unique, that I'm sure I'll turn to at critical creative junctures. I'd give this 4 starts if I thought it was dropped from development, but the web site claims they're still following an upgrade route and I am excited to see where the future will take her.

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RAPID Synthesizer

Reviewed By Demuvi [all]
February 12th, 2022
Version reviewed: on Windows

The synth itself is fantastic. The possibilities are massive and the FM synthesis or resynthesis as well as graintable synthesis is massive despite the low CPU. The presets that are included sound highly professional.

However, I have to deduct a star for the worst support in the world, which is also sometimes very personally insulting. Manufacturers don't like hearing about bugs or features, and updates and essential bug fixes are unfortunately very rare.

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RAPID Synthesizer

Reviewed By jdoppenberg [all]
November 5th, 2021
Version reviewed: 1.8.5 on Windows

I like the idea of having just one synthesizer and learning how to use it really well, rather than jumping back and forth between a bunch of synthesizers and using them all poorly. I have tried all the synthesizers everyone talks about, but for me Rapid just meets all the criteria: a synth that does everything and does it well! The fact that you can use Rapid as an effects plugin makes it even more versatile! Rapid replaces a dozen synthesizers and effect plugins and is extremely light on CPU! The best value for money.

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RAPID Synthesizer

Reviewed By n2077 [all]
August 28th, 2020
Version reviewed: 1.8.0 on Windows

This synth appeared for me out of nowhere when a friend got it. I have never paid this much for VST synth before but this is incredible and I'm very glad I got it! There are so many complex options but they are so straight forward it remains approachable and intuitive to work with. No synth before had let me create great sounds by end of day one of this high quality. The workflow some of the best I ever worked with. The built in effects are awesome too, the reverb sounds so good I end up using Rapid FX instead of my usual reverb and effects.

5/5 Really good synth that out of nowhere became my endgame.

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RAPID Synthesizer

Reviewed By Amit Sharma [all]
January 17th, 2020
Version reviewed: on Mac

For me, this is the best synth in the world. I have other synths like Serum, Massive, Avenger. But Rapid has become my go to synth. The workflow and the quick and amazing results that you get from this synth is just awesome.

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Comments & Discussion for Parawave Audio RAPID Synthesizer

Discussion: Active
19 January 2020 at 7:53am

I agree a fantastically versatile synth.

27 November 2020 at 6:55am

One of the best. If you haven't used it yet, I'm a little envious of you. This is a real discovery in the world of music creation.

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