ASM Hydrasynth Deluxe 16-Voice Polyphonic Synthesizer


The HYDRASYNTH DELUXE is the flagship Hydrasynth, offering a dual sound engine setup and the largest ASM PolyTouch® polyphonic aftertouch keybed to date. In short,  Hydrasynth Deluxe combines two ASM Hydrasynth sound engines into one unit and marries it with a 73-note keyboard - but there's a lot more to it than that.  The user interface is designed with the utmost attention to detail and offers a rapid workflow. A great-sounding, increadibly flexible synth, ideal as a performance-led keyboard that can reach a wide range tones and textures.

  • Up to 8 independent voices per each patch
  • Dual engine with separate stereo output pair
  • 3 Oscillators with 219 single-cycle waveforms
  • Full polyphonic aftertouch
  • 4 Octave ribbon controller (67 cm) & theremin mode
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The HYDRASYNTH DELUXE is the flagship Hydrasynth, offering a dual sound engine setup and the largest ASM PolyTouch® polyphonic aftertouch keybed to date. The user interface is designed with the utmost attention to detail and offers a rapid workflow 

Each of the two sound engines features 3 Oscillators, dual Wave Mutators and 2 filters, that can be configured in series or parallel. Both of the sound engines has its own separate balanced analog audio outputs. The tone generating capabilities are simply unmatched.

As for the performance capabilities, The HYDRASYNTH DELUXE has our proprietary 73-note Polytouch™ keybed that offers polyphonic aftertouch over each note, giving you the type of expressive control found only in certain vintage synths.

Add to this a 4 octave ribbon controller and ergonomically designed pitch and mod wheels and you have expression and control that is not equaled in any other hardware synthesizer on the market… Today or ever.

Dual Sound Engines

The 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 includes 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 the 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 HYDRASYNTH DELUXE features the ASM Polytouch® 73-note semi-weighted keybed, allowing both ON/OFF velocity and aftertouch as well as full polyphonic aftertouch.

In recent years companies have been trying to find ways to give the keyboard musician more ways to better express themselves. The problem is that their solution is almost never a keyboard, so you have to learn a new technique to play them.

The Polytouch™ 73-note 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.


The tone generation capability is the heart of any synthesizer.

The oscillators allow you to choose from a selection of 219 single cycle waveforms.

Wavemorphing is a feature usually found on synths with preset wave tables. Creating user wavetables is arduous or downright impossible. Unlike most wavetable synths, our oscillators 1 & 2 have our WAVELIST mode.

This mode  allows you to pick and choose 8 waves, from our bank of 219, arrange them in the order you want, and then morph from one to another.


Oscillators 1 & 2 are routed into our MUTATORS. The Mutators allow you to modulate, bend and sculpt the sound in new (and old) ways.

Each MUTANT allows you to choose from 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 amount.

  • Hard Sync - This gives you those classic hard sync sounds. Try hard syncing a morphing wavetable for some fun.

  • Pulse Width - This will pulse width modulate ANY input sound. 

  • PW - Squeeze - This is a different form of pulse width mod that creates a smoother sound.

  • PW-ASM - this mode divides the incoming wave into 8 slices and allows you to set how much pulse width mod will happen in each section.

  • Harmonic Sweep - this will sweep the harmonics of the incoming sound.​

  • PhazDiff - this takes the input signal, shifts the phase and then creates a difference result with the original signal

The Mutant's can also generate its own waveforms in both FM and Sync modes so that you do not have use 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 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 of 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.

​The first filter has 16 different filter models, giving you multiple options for tailoring your sound.

The second filter is a 12db per octave has a continuous sweep from either low pass > bandpass >high pass or low pass > notch > high pass, similar to the way the classic SEM filter worked.


5 Low-Frequency Oscillators…YES, 5. 

Much like our sound engine, the LFO’s are not ordinary by any means.

The Hydrasynth LFO’s feature 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 waveforms to choose from.

The LFO's all have delay, fade in, 3 triggering modes, smoothing, start phase, one-shot mode so that they can act as envelopes and BPM sync. 


5 DAHDSR Envelopes……YES 5. 

An advanced sound engine needs plenty of modulation sources. Our 6 stage envelopes feature Delay, Attack, Hold, Decay, Sustain and Release stages.

The time settings for the stage can be set in seconds or in time divisions, giving you envelopes that play in sync to your song. 

You can also loop the envelopes to create LFO’s whose shape can be voltage controlled in the modulation matrix.

The envelopes have the added ability to be triggered from multiple sources.


The modulation capabilities on the 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 Modulation matrix points themselves can also become modulation destinations.

Modulation sources & destinations include the CV Mod In & Out jacks as well as MIDI CC’s


In MULTI mode, the UPPER and LOWER part can have its 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 other 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 LFO’s, Envelopes, Polyphonic Aftertouch or the Ribbon controller to modify your arpeggios in real time.


The HYDRASYNTH DELUXE can have separate MIDI channels assigned to its LOWER and UPPER part in MULTI mode. The CV/GATE settings will respond to the UPPER part.

There is the standard MIDI and USB/MIDI interfaces on the synth but we go deeper and 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, as well as some of the Japanese Volts>HZ products. The MOD in and outs allow for modulation from DC to full audio ranges, expanding your modulation capabilities.

Main Controls

The Main system controls are where you navigate your patches in both SINGLE and MULTI mode, configure system settings and see parameters like the envelopes, waveforms, filters in 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 good feedback on what is going on. 

The VOICE parameters give you access to play modes, micro-tuning, analog feel, voice panning and many other features.


The patch MACROS are designed to allow the user deep control over the engine in live performance. 

In the HYDRASYNTH DELUXE, it is possible to control the macros of both the LOWER and UPPER parts in MULTI mode at the same time.

The 8 assignable encoders and buttons can each be routed to 8 destinations. Complete sound transformations can take place with the press of a button or turn of a knob. 


The Hydrasynth comes with 8 banks of 128 patches in SINGLE mode. There are 5 banks of 128 MULTI mode patches and these both hold a LOWER and UPPER patch which are separate from the SINGLE patches.

Finding the patch you want and searching the library is made easy with our BROWSER. Our PC/MAC based Patch Manager application also allows easy moving of patches to create your favorite order as well as load in new patch libraries in the future.


The effects chain goes beyond the typical ones found in other synths. Pre-effects and post-effects give you some unique ways to process your sound.

In the HYDRASYNTH DELUXE, the 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. 

The effects are the perfect way to complete your sound, in the box.

Physical Specifications

Metal Chassis

  • Steel top and bottom

  • Aluminum side panels

PolyTouch© Keybed

  • Semi-weighted

  • Polyphonic aftertouch

  • Note On and Note Off Velocity

4 octave (67 cm, 26.4”) Ribbon controller

  • Pitch bend mode

  • CC control mode – modulation source

  • Theremin mode - triggers envelopes and plays pitch

  • Continuous pitch or choose from multiple scales

8 banks of 128 patches in SINGLE mode 5 banks of 128 MULTI mode patches 5 banks of 128 patches for the LOWER part in MULTI mode 5 banks of 128 patches for the UPPER part in MULTI mode

CV gate input and oututs 

  • Support multiple CV/GATE standards

  • CV

  • 1v per octave +/-5V

  • Hz to Volts +/-5V

  • Hz to Volts 0-10V

  • 1.2V per octave

  • Gates

  • V-trig, S-trig

  • 3V, 5V, 10V

  • Mod In/Out range

  • +/5V, 0-10V, 0-5V, 0-1V

  • Clock in and out

  • 1PPS, 2PPQ, 24PPQ, 48 PPQ

  • Clock Voltage - 3v, 5V, 10V


  • Voice overflow mode for expanding voices with another Hydrasynth

Expression pedal input

Sustain pedal input

DC input jack

USB port

  • Supports USB MIDI In/Out


1131 x 359 x 119 mm 44.5” x 14.1” x 4.7” (inch)


13.5 kg (29.8 lbs)

Sound Path Specifications

16 Voice Advanced Wavetable synthesis

2 Wavemorphing Oscillators

  • 219 single cycle waveforms

  • User wavetables - 8 user selectable ‘wavelist’ per osc to build user wavetables

  • Every osc and patch can have its own user wavetable

  • WaveScan parameter for modulating through wavetables.

  • Keytracking – 0-200%

  • +/- 3 octave tuning range

1 fixed Wave OSC

  • 219 single cycle waveforms

  • +/- 3 octave tuning range

  • Keytracking – 0-200%

Dual Mutators per oscillator

  • FM – Linear FM

  • Selectable Modulator source

  • Built in Sine & Triangle, OSC1, OSC2, OSC3, Mutators A, B, C, D, Noise gen, Ring Mod, External Mod 1&2 input.

  • WaveStack – Generates 5 detuned waves from input source. Detune amount.

  • Pulse Width Mod – Adjust pulse width of ALL waveforms.

  • PWSqueeze – Compresses the center section of the waveform. Differnnt type of PWM

  • PW-ASM – 8 User adjustable wave squeeze/stretch points.

  • Hard Sync – gives that classic sync sweep sound.

  • Selectable Sync input source.

  • Harmonic Sweep – will scan through the harmonics of the incoming sound.

  • PhazDiff - creates a new sound by combining phase shifting and summing techniques.

  • Dry/Wet mix to blend the original OSC source.

Noise Generator

  • White, Pink, Brown, Red, Blue, Violet, Grey noise sources

Ring modulator

  • Selectable input sources

  • OSC1, OSC2, OSC3, Noise, All Mutator outputs, External Mod ½ in.

  • Depth control

Sound source mixer

  • Mix the following sources - OSC1, OSC2, OSC3, Noise, and Ring Mod.

  • Panning for each source

  • Filter routing mix

  • Solos for each source (solo status is saved in the patch)

Two Filters

  • Series or parallel routing

  • Filter 1

  • 12 & 24db modern ladder (compensated)

  • 12 & 24db vintage ladder (uncompensated)

  • Threeler HP, LP

  • MS20 HP, LP

  • Low Pass Gate

  • STN LP, BP, HP

  • 1 pole LP

  • 8 pole LP

  • Vocal filter

  • Multiple vowel order parameter

  • Formant parameter

  • Filter 2

  • Continuously Variable Low pass > Band pass > High pass

  • Continuously Variable Low pass > Notch > High pass (Oberheim SEM style)

Modulation Specifications

5x Low Frequency Oscillators

  • 10 static waves

  • Sine, triangle, Square, Saw up, Saw down, S&H, Low random, Noise, Pulse width 25%, Pulse Width 12.5%.

  • Step Wave – 64 steps that the user can set (like a step sequencer).

  • Step smoothing

  • Step glide

  • SemiLock for pitch sequencing

  • Clock sync

  • Starting phase

  • Start delay

  • Fade in

  • Master output gain

  • Trigger modes – mono, poly, free

  • One shot mode

5x Envelope Generators

  • 6 stage DAHDSR envelopes

  • Delay, Attack, Hold, Decay, Sustain, Release

  • Slope curves for ADR stages

  • Variable from full exponential to full logarithmic

  • Tempo or Time option for setting length of each stage.

  • Looping of AHD stages for creating LFO types of modulations.

  • Trigger modes – Legato, Reset, Retrigger

  • Trigger Sources - up to 4 sources can be assigned to trigger each envelope.

Matrix modulation

  • 32 slots for source-destination mod routings with amount

  • Modulation matrix slots can be mod destinations

8x Macro knobs and buttons

  • Each macro knobs allows positive and negative of up to 8 destination controls

  • Macros can be modulation destinations


  • Arp parameters can be modulation destinations.

  • Modes

  • Up, down, up/down, Up&down, random, note order, chord, pattern

  • Octave

  • Range, 1,2,3,4

  • Play order

  • Up, down, up/down

  • Swing

  • Gate time

  • Ratchet – repeats notes

  • Chance – sets how often the ratchet takes place.

Effects Specifications

Pre-effects – before Delay and Reverb

  • Chorus, Flanger, Rotary, Phaser, Lo-Fi, Tremolo, EQ, Compressor (with side chain), Distortion


  • Mono, Stereo, Panning, LCR, Reverse


  • Hall, Room, Plate, Cloud

Post-effects – after Delay and Reverb

  • Chorus, Flanger, Rotary, Phaser, Lo-Fi, Tremolo, EQ, Compressor (with side chain), Distortion

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ASM Hydrasynth Deluxe 16-Voice Polyphonic Synthesizer