CG Products
design — construction — sound

Eurorack Module


Dynamic Percussion Interface

Peak+Hold front view
Front view
  • Dynamic signal processing
  • 9 different CV/signal outputs
  • Manual level, trigger and filter controls of the input signal
  • Selectable frequency band (for cascading 2 or more P+Hs)
  • Pickup included
  • Width: 10 HP
  • Dimensions: 128,5 mm x 50,5 mm
  • Depth: 35mm
  • Supply voltage: ±12V
  • Current: +12V: ≈78mA; -12V: ≈55mA
  • Optionally available in banana version
The analog Peak+Hold module allows to play and control analog synthesizer equipment by using a drum with a pickup (or any other percussive signal source).
9 different CV/signal outputs are generated by one percussive input signal. The outputs are providing a dynamic hold voltage (linear and logarithmic), a dynamic impulse signal e.g. for triggering filters or delays, a dynamic release signal (linear and logarithmic), an envelope and a gate signal. Additionally, the original sound (amplified) is available for further signal processing.
The input stage is equipped with adjustable level and trigger controls and a filter for flexible adaptation of different percussive instruments – such as long or short sounding, high or low drums and cymbals. Furthermore, there is a 2nd input to cascade two Peak+Holds or to add another signal source.
In general, the Peak+Hold will be delivered with a piezo pickup included as standard accessory to the module, but it is also available without.
Without pickup, the Peak+Hold can be used for creating additional CVs and triggers from any percussive input signal (e.g. from a drum machine or an audio player).
  • Peak+Hold Panel Drawing

    Panel drawing

  • Peak+Hold side view left I

    Left side view I

  • Peak+Hold side view left II

    Left side view II

  • Peak+Hold side view left III

    Left side view III

  • Peak+Hold side view right I

    Right side view I

  • Peak+Hold side view right II

    Right side view II

  • Peak+Hold side view right III

    Right side view III

  • Peak+Hold back view

    Back view

  • Peak+Hold banana version

    Banana version frontal

  • Peak+Hold banana version side view right

    Banana version right

  • Piezo pickup

    Piezo pickup


XR22VCO, 2 X multipliers, Noise (played with Drum)

Delay1022 with KorgMS20 filters & VCA (played with Drum)

2 P+Hs in frequency-selective mode; 2 XR22VCOs, Delay1022, KorgMS20 (played with Drum)

Input: Cymbal; 2 XR22VCOs, Delay1022, KorgMS20

Input: Rhythm machine; XR22VCO, Delay1022

Or listen on

Principle of Operation

Similar to a ‘Sample & Hold’, the Peak+Hold detects an input signal’s amplitude when triggered and keeps it as a hold voltage until the next trigger appears. But in contrast to the S&H, which keeps the signal amplitude at its momentary level, the P+H holds it on the highest detected point (peak).

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The following incoming signal resets the Peak+Hold again by triggering at a very low amplitude point at the beginning, and the next hold value will be set. This trigger threshold is adjustable by knob ‘Trigger’. Further, there is a special ‘Filter’ knob allowing to adapt the P+H to various input signal sources, such as drums or cymbals. Because one have to make a compromise between fast response and minimal noise susceptibility, the internal envelope signal needs to be filtered. This special lowpass filter is only affecting the falling edges of the envelope, ensuring minimal latency and best response to all percussive input sounds.
‘Impulse Out’ and ‘Release Out’ are having a slightly different operation principle in comparison to the Peak+Hold CV generation: After triggering by an input signal from a certain threshold, a minimal latency time is internally set. At the end of this time, the momentary volume amplitude value is detected and generates now the hold voltage on the outputs ‘Impulse Out’ and ‘Release Out’. Duration of the impulse signal can be regulated by knob ‘Impulse’, length of the release time by knob ‘Release’.

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Examples of typical output waveforms

Peak+Hold output waveforms

Pickup settings

There is a piezo pickup and double-sided adhesive tape included to the Peak+Hold module package by standard, so it is easy to connect the P+H to any percussive instrument. The pickup is equipped with 1/4′ jack and 2m cable.

Pickup on bongo drum Pickup on cymbal Pickup on tabletop Pickup on wooden board
Bongo drum Cymbal Tabletop Wooden board


Simple patches with other (CG Products’) modules

Peak+Hold controlling XR22 VCO FT

1. Peak+Hold controlling the XR22 VCO FT The Peak+Hold‘s linear release output is connected to the XR22VCO FT‘s AM input and controls the VCO’s sinewave/triangle output amplitude.

Different XR22VCO frequency settings …Peak+Hold CV outs are controlling the VCO’s frequencies (in FSK mode)

Peak+Hold controlling Delay1022

2. Peak+Hold triggering the Delay1022 The dynamic pulse output of the Peak+Hold triggering the Delay1022 is a simple way to create percussive drum- and string-like sounds. Instead of a delay, also VCFs with high resonance can be triggered.

Different Delay1022 Lowpass filter settings …Peak+Hold CV output is controlling the delay time

Peak+Hold controlling 2 X multipliers

3. Peak+Hold and X multipliers The Peak+Hold ‘s logarithmic release output is connected to the control inputs of 2 X multipliers. The multipliers are working as exponential VCAs with different operation points (see different positions of knobs ‘Offset’ and ‘Level’). The 2nd X multiplier only gets active from a certain CV amplitude level.

1st X audio signal in: VCO 2nd X audio signal in: Noise/VCO; Peak+Hold Input: Pickup on drum …Rhythm machine

Peak+Hold with Pre

4. Peak+Hold with Pre When running the Peak+Hold with the Pre (The preamplifier’s output is applied on ‘In 2’ ), the Pre‘s knob ‘Sensitivity’ is overtaking the function of the Peak+Hold knob ‘Input1 Level’ (which is only referring to input socket ‘Drum In’).

Pre Microphone input: Different percussion instruments. Peak+Hold CV outs are controlling cutoff frequencies of Korg MS20 VCFs and VCA envelope

Please note: The panels of the modules are made from untreated natural aluminium, hand printed and varnished. Due to this manufacturing process, their surface may have little scratches or unregularities or may slightly differ in their color appearance.


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