DIY Peaks (Grayscale)

DIY Peaks (Grayscale)


DIY Peaks (Grayscale)

Peaks provides 4 different functions in a small 8hp package: ADSR, LFO / Tap tempo LFO, and a drum synth.

Their common point? They are all about generating an audio or CV signal in response to a trigger and are all focused on rhythmic works.

Peaks is a dual-channel module – making it very useful for duophonic patches or for controlling/synthesizing the kick/snare rhythmic backbone of a patch.



Four in one...

ADSR Envelope Generator

  • Segment durations range from 0.2ms to 8s.

  • Quartic attack, exponential decay, exponential release.

LFO and Tap-Tempo LFO

  • 0.03 Hz to 160 Hz.

  • 5 basic waveforms: square, triangle, sine, stepped, random.

  • Waveform variations and morphing for each of these: PWM, slope, folding/harmonics, step size, interpolation.

  • Phase at reset control.

  • Tap LFO can lock onto irregular rhythms.

Drum Synth

  • Channel 1: 808 kick model with extra parameters (tune, punch).

  • Channel 2: 808 snare model with extra parameters (tune, decay).

  • Channel 2: A specific combination of settings transforms the snare into a modeled 808 hi-hat.

Control Modes

  • Twin: Channels 1 and 2 share the same parameters but can be triggered independently.

  • Split: Channel 1 is edited by knobs 1 and 2, and channel 2 is edited by knobs 3 and 4, with a simplified 2-parameter control scheme.

  • Expert: Channels 1 and 2 are completely independent.



  • Width: 8hp
  • Depth: 25mm
  • +12V Current: 60mA
  • -12V Current: 2mA
  • Inputs: 100k impedance, threshold at 0.6V.
  • 16-bit CV/audio generation with 48kHz sample rate.
  • Output level: 0 to +8V for envelopes, 10Vpp for LFOs and drum signals.
  • The STM32 32-bit Cortex MCU comes already flashed in the kit, using the lastest firmware.

PCBs are produced by synthCube and finished in blue PCB material with a gold immersion.
Panels are designed and produced by Grayscale.
The full kit includes the panel, a synthCube PCB, Rogan knobs, Alps pots, all necessary components, mounting hardware, and a power cable. 
Don't worry if you drop an SMT part — for the 0603, 0805, and 1206 packages, we include an extra!! If you don't lose SMT parts, keep the spares to build up your shop inventory.


Module Parameters
Panel Size8hp

Write a review

Please login or register to review
  • from $15.00 TO $185.00
  • Ex Tax: $15.00

Available Options

flashed ARM
In stock / $25.00
Available : 4
full kit
In stock / $185.00
Available : 3
In stock / $30.00
Available : 5
In stock / $15.00
Available : 7

Tags: diy, eurorack, kits, module, mutable instruments, drums, lfo, oscillator, tap-tempo,