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Winter Plankton


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Product number: CV4033

Percussion-Line Synth Voice

  • +12V mA
    -12V mA
    +5V mA
    Width 24HP
    Depth mm


Percussion-Line Synth Voice

Zaps is a percussion-line-synth voice designed for creating organic percussive sequences that can mutate over time. It uses a combination of different techniques like controlled randomness, morphing, and storing (or locking) synth-voice parameters in externally sequencable CV-controlled slots. The synth voice is a digitally-controlled-two-oscillator-FM and AM-analog engine with two envelopes and cross-modulation.


  • Sequence Preset Slots externally for changing percussion or synth lines
  • Add subtle randomness to any parameter for slightly changing sounds, or go wild for unpredicted surprises on every trigger
  • Morph sounds between Slots
  • Assign accent to any parameter for added expressiveness
  • Randomly generate full banks of sounds
  • Capture any randomly generated sound into a preset slot for further editing
  • Freeze/Revert the state of the module for careless editing during live performances
  • Live editing of a single or multiple Slots simultaneously for expressive tweaking
  • Generate melodic percussion or synth lines with the V/O tracked oscillators
  • Use CV-in control of any parameter or CV-out control for external modules (control FX-sends or automate external-synth parameters)

SYNTHESIS - The synthesis board is an analog circuit with two VCOs, two envelopes, AM, FM, high-pass filters, and a two-channel mixer.


  • Triangle core VCOs with V/oct inputs and Fine and Coarse controls.
  • VCO 1 waves: Sine, Triangle, Sawtooth, and Square.
  • VCO 2 waves: Sine, Triangle, Sawtooth, Square, Double Sine, and White Noise.
  • VCO2 has two separate wave outputs, one for the AM and the other for the FM and the Mixer-Channel 2.


  • Two AHR (Attack, Hold, Release) envelopes.
  • The hold time can be set internally or externally (Gate ON) for each envelope.
  • Envelopes can be faded from logarithmic to linear responses.
  • Each envelope can control the Pitch/Tone of the VCOs (Pitch Envelope), the amount of AM or FM (Envelope 1), the VCA for both channels (Envelope 2).


  • The amplitude modulation goes from VCO2 to VCO1.
  • It can be set in two ways: straight to VCO1 or through a VCA controlled by Envelope 1.


  • The frequency modulation goes from VCO2 to VCO1 and from VCO1 to VCO2 (XFM).
  • FM can be set in two ways: straight to VCO1, or through a VCA controlled by Envelope 1.

MIXER: Two-channel mixer for the two VCOs.

HIGH-PASS FILTER: There are two HPFs. HPF1 filters the mixer output. HPF2 filters the white noise.



  • Each project contains twelve banks; each bank contains twelve slots; each slot contains a sound.
  • All projects are stored on an SD card.


  • Randomize values on a per trigger basis
  • Independent random control for each synth parameter
  • Set ranges to any random value for controlled randomness
  • Relatively attenuate all parameter-random amounts with a single global random fader
  • Populate slots or banks with randomly generated sounds

FREEZE/REVERT: Take a snapshot of the whole project, modify it and go back to the original state.


  • Parameter interpolation between two slots on a per trigger basis.
  • Control the balance between the two slots with one fader — crossfade style!

CV ASSIGN and More!

  • Any of the six CV-connectors can be configurable as both inputs or outputs and set to different ranges (0/10V, 0/8V, -5/5V, 0/5V).
  • CV-inputs can be internally attenuated
  • Control almost any synth parameter, value, or setting on a per trigger basis. For example, Accent, Slot Selection, Morph assignments, Next/Prev Slot, Random Slot, Oscillator-Wave Selection, any of the synth parameters (Pitch, Release, AM, FM, Global Random…) or any of the random parameters (Random Pitch, Random Filter, Random Hold…)
  • Output any parameter-CV values through any of the assignable I/Os
  • Alt-fader-CV output for controlling external parameters, like Send-FX for each slot.
  • CV-slot/Gate out — Useful for externally recording finger drumming!
  • ACCENT ASSIGN: Add dynamics by assigning the accent input to control any one of the synth parameters
  • COPY: Copy Slots (also between banks)
  • SNAPSHOT: Take a snapshot of the last sound heard (flatten the values for further editing), including the effects of CV-in, Morph, and Random. Very useful for easily creating banks from scratch!
  • EDIT ALL: Action over faders has an effect on the twelve Slots. Use hints: Live tweaking, homogenize, “tame” a Sound Bank, or modify all Slot parameters while sequencing the Slots via CV-input.
  • FILE SYSTEM: Save, Load, Name, and Rename projects, banks, sounds and sort them into folders.

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