ASM Hydrasynth Deluxe Polyphonic Wavemorphing Synthesizer

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Ashun Sound Machines 73-Key Polyphonic Wavetable Synthesizer Keyboard with Dual Sound Engines, Polyphonic Aftertouch and Multi-Function Ribbon Controller
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ASM Hydrasynth Deluxe is the flagship Hydrasynth, offering a dual sound engine setup and the largest ASM PolyTouch polyphonic aftertouch keybed. The user interface is designed with the utmost attention to detail and offers a rapid workflow. Each of the two sound engines features three oscillators, dual Wave Mutators and two filters that can be configured in series or parallel. Each of the sound engines has its own separate balanced analog audio outputs.

On the performance side, the proprietary 73-note Polytouch keybed offers polyphonic aftertouch control over each individual note. Add to this a four-octave ribbon controller and ergonomically designed pitch and mod wheels and you have expression and control not equaled by any other hardware synthesizer.

  • 8-voice polyphonic digital wave morphing synthesizer with dual sound engines
  • Polytouch polyphonic aftertouch keyboard with 73 full-size keys
  • MPE (MIDI Polyphonic Expression) compatibility
  • Multi-function ribbon controller: modulation, pitch bend, theremin mode
  • Microtuning support via MIDI Tuning Standard files
  • 3 oscillators per voice with 4 Mutators total
  • 1 multimode filter and 1 variable/sweepable LP-BP/notch-HP filter per voice
  • 640 patch storage locations with category search
  • CV/gate connectivity

Dual sound engines
Hydrasynth Deluxe offers 16 voices of polyphony in Single mode that can be split into two completely separate 8-voice sound engines in Multi mode. The two Multi modes for separate sound engine operation are KeySplit, which creates classic keyboard splitting between two patches, and Dual, which enables layering of two patches over the whole keyboard. A dedicated balance knob for direct adjustment of the mix between lower and upper parts of a Multi patch is available on the panel, as well as separate stereo audio outputs and MIDI channel assignments for true bi-timbral operation.

Polytouch keybed
The 73-note semi-weighted ASM Polytouch keybed goes beyond the standard velocity and aftertouch found on other keybeds with full polyphonic aftertouch and on/off velocity. In recent years companies have been trying to find ways to give the keyboard musician more ways to better express themselves; the problem is their solution is almost never a traditional keyboard, so you have to learn a new technique to play them. The Polytouch keybed features high quality, standard sized keys so you can start playing it instantly.


Ribbon controller
Add expression to any patch using the 4-octave ribbon controller, perfectly situated above the keyboard. The ribbon controller is freely assignable as a source in the mod matrix, but it can also be used in 'Theremin mode,' where it will send both trigger and pitch.

Hydrasynth's 3 oscillators allow you to choose from a selection of 219 single-cycle waveforms. Unlike most wavetable synths, Hydrasynth oscillators 1 & 2 have a WaveScan mode that allows you to choose 8 waves from the bank of 219, arrange them in the order you want and then morph from one to another.

Oscillators 1 & 2 are routed into Mutators that allow you to modulate, bend and sculpt the sound using the following processes:

  • FM-Linear for making classic FM sounds. Choose multiple FM sources, including external inputs.
  • Wavestack creates 5 copies of the incoming sound and allows you to set a detune spread amount.
  • Hard Sync gives you those classic hard sync sounds. Try hard syncing a morphing wavetable for some fun.
  • Pulse Width will pulse width modulate any input sound.
  • Squeeze is a different form of pulse width mod that creates a smoother sound.
  • PWM-ASM divides the incoming wave into 8 slices and allows you to set how much pulse width mod will happen in each section.
  • Harmonic Sweep will sweep the harmonics of the incoming sound.​
  • PhazDiff takes the input signal, shifts the phase and then creates a difference result with the original signal.
Mutants can also generate their own waveforms in both FM-Linear and Hard Sync modes so you do not have to 'use up' another oscillator. Of course the routing is flexible, so you can choose the other oscillators as mod sources if you like.

Mixer/filter routing
The 3 oscillators are fed into a mixer along with the noise generator and ring modulator. The mixer allows you to mix levels as well as pan the input source. There is a balance control that allows you to choose how much signal from each source is routed to filters 1 and 2. The filters can be set to be parallel or series for ultimate flexibility.

If oscillators and tone generators are the heart of a synthesizer, the filters are the soul. Hydrasynth has two filters that can be configured in series or parallel. The first filter has 16 different filter models, giving you myriad options for tailoring your sound. The second filter is 12dB per octave and has a continuous sweep from either low pass > band pass > high pass or low pass > notch > high pass, similar to the way the classic SEM filter worked.

Much like its sound engine, Hydrasynth's 5 LFOs are not ordinary by any means, with a step mode that allows you to create patterns with up to 64 steps. Having 5 mini step sequencers gives you an amazing amount of possibilities for further shaping your sound. Of course, there are also 10 standard LFO waveforms to choose from. The LFOs all have delay, fade in, 3 triggering modes, smoothing and start phase controls as well as a one-shot mode so that they can act as envelopes and sync to BPM.

An advanced sound engine needs plenty of modulation sources. Hydrasynth's 6-stage envelopes feature delay, attack, hold, decay, sustain and release stages. The time settings for each stage can be set in seconds or in time divisions, giving you envelopes that can play in sync with your songs. You can also loop the envelopes to create LFOs whose shapes can be voltage controlled in the modulation matrix. The envelopes have the added ability to be triggered from multiple sources.

Modulation matrix
The modulation capabilities on Hydrasynth are endless. With 32 user-definable modulation routings, you will have plenty of ways to use the 29 modulation sources and 155 modulation destinations. Almost everything in the synth engine can be a modulation destination, including the effects and arpeggiator. The mod matrix points themselves can also become modulation destinations. Modulation sources and destinations include the CV Mod In & Out jacks as well as MIDI CCs.

In Multi mode, the upper and lower parts can have their own separate arpeggiator settings. The arpeggiator allows for standard note arpeggiations but also has a phrase arpeggio built in. Parameters like Ratchet and Chance will generate rhythmic patterns with some randomness to add life and spontaneity to your performance. You can also modulate most of the parameters in the arpeggiator, so imagine using LFOs, envelopes, polyphonic aftertouch or the ribbon controller to modify your arpeggios in real time.

CV/gate, MIDI, USB
Hydrasynth has standard MIDI and USB/MIDI interfaces but also goes deeper to allow the use of CV/gate interfaces for connecting to the modular world. It supports the standard voltages for eurorack modulars, the 1.2V per octave Buchla standard and even some Japanese Hz-per-volt standards. The modulation inputs and outputs allow for modulation from DC voltage to full audio rate, expanding your modulation capabilities. Hydrasynth Deluxe can have separate MIDI channels assigned to its lower and upper parts in Multi model. The CV/gate settings will respond to the upper part.

Main controls
The Main section of system controls is where you navigate your patches in both Single and Multi modes, configure system settings and see parameters relating to envelopes, waveforms and filters on the OLED screen. Init and Random buttons will allow you to initialize or randomize a complete patch or specific modules with a press & hold + module select button. Pressing the Home button returns you to navigating patches in a simple and easy way.

Master controls
The Master control section is where all parameter editing, patch naming and macro performing is done. Using OLED screens, high-resolution encoders with LED rings and 8 buttons, this section is designed to give you comprehensive feedback and control. Voice parameters found here give you access to play modes, analog feel, voice panning and many other features.

Macros give you deep control over the engine in live performance. The 8 assignable encoders and buttons can each be routed to 8 destinations each. Complete sound transformations can take place with the press of a button or turn of a knob. On Hydrasynth Deluxe you can control the macros of both the lower and upper parts in Multi mode at the same time.

Hydrasynth has storage for 5 banks of 128 patches each in single mode. There are 5 banks of Multi mode patches that hold both a lower and upper patch separate from the Single mode patches. Finding the patch you want and searching the library is made easy with the browser. Free patch manager companion software for Mac/PC allows easy moving of patches to arrange your banks as well as load in new patch libraries.

The effects chain goes beyond the typical options found in other synths with pre-effects and post-effects giving you unique ways to process your sound. For Hydrasynth Deluxe, Multi mode enables two completely separate effects chains for the lower and upper parts. The delays and reverbs were modeled on some of the most popular effects on the market, making these effects the perfect way to complete your sound – in the box.

More Information
Manufacturer Ashun Sound Machines
Condition New
Included from Manufacturer Attachable accessory shelf
Power supply
Analog/Digital Digital
Number of Keys 73
Weighted Keys Semi-Weighted
Key Action Semi-weighted velocity-sensitive keybed with polyphonic aftertouch
Aftertouch Yes
Programs/Presets 640 Multi mode preset storage locations (5 banks of 128 patches each)
640 Single mode preset storage locations (5 banks of 128 patches each)
256 factory presets
Voices of Polyphony 16
Oscillators per Voice 3
Multitimbral Bi-timbral
Effects 4 reverb types
5 delay types
Independent Pre FX and Post FX with chorus, flanger, rotary speaker, phaser, lo-fi, tremolo, EQ, compressor, distortion
Arpeggiator Yes
MIDI In, Out, Thru, USB
USB Port (to Host) MIDI, System Updates, Editor/Librarian/Patch Manager
Audio Inputs Mod 1 and Mod 2 1/8" inputs on CV/gate patch panel can accept audio input for pass-through or processing by Hydrasynth sound engine
Audio Outputs Dual balanced 1/4" stereo main/upper output
Dual balanced 1/4" stereo lower output
1/4" stereo headphone output
Control Connections 1/4" sustain pedal input
1/4" expression pedal input
CV/gate patch panel with 5 outputs and 2 inputs
Onboard Controllers Multi-function ribbon controller
Pitch bend wheel
Mod wheel
Width 44.5"
Depth 14.1"
Height 4.7"
Product Weight 29.8 lb
Unique Features Polyphonic aftertouch keybed
MPE (MIDI Polyphonic Expression) compatibility
Microtuning support via MIDI Tuning Standard files


Ashun Sound Machines offers a 2-year warranty on its products.

You will need a copy of your purchase receipt to verify your purchase date. Please keep it in your files.

ASM covers any workmanship or parts failures that are not attributed to abuse or misuse.

  • Ground shipping is FREE for all orders $99 and up.
  • Our central, midwest location ensures fast delivery times.
  • See below for transit day estimates. Please note, these are estimates and are not guaranteed.

Generally, package estimated transit days are as follows:

  • Upper Midwest: 1-3 days
  • Central US, South East US, and East Coast: 2-4 days
  • West Central US: 3-5 days
  • West Coast: 4-6 days
  • Alaska & Hawaii: 7+ days
All transit times are based in business days. Please allow 7-10 business days for most freight shipments. Business days are Monday through Friday and do not include public holidays and weekends (Saturday/Sunday.) For questions regarding estimates to your specific location, please contact us at [email protected] or 800-783-3368.