Eurorack Module


Low Noise Preamp for Microphones and Pickups

The Pre module allowes the embedding of signals from electro dynamic sound sources such as microphones or pickups (e.g. e-guitars) in modular synthesizer equipment. Its high amplification together with a very low noise floor allows the processing of even very low input signals (such as from dynamic microphones). The module is equipped with a ‚Sensitivity‘ knob to adapt it to different input levels, coming from different pickups or microphones. A red LED indicates when the level is overdriven, causing the signal to become saturated; here the preamp soft clips the signal. Additionally, a trimmer on the back of the module allowes the setting of the max. output gain – between 3Vpp and 18Vpp. Further, there is a jumper to optionally supply an electret microphone with +12V power supply, provided on the middle ring of a 3-pole jack.


Pre Banana Version

Pre Minijack Version

  • Very low noise
  • Adjustable input sensitivity
  • Soft clipping behaviour with red indicator LED
  • Output gain trimmer (max. output signal ca 18Vpp)
  • Optional +12V power supply for electret microphones
  • Available with banana or 3,5mm minijacks
  • Eurorack module
  • Width: 5 HP
  • Dimensions: 128,5 mm x 25,2 mm
  • Depth: 40mm
  • Supply voltage: ±12V
  • Current consumption (postive rail, without load): ≈10mA


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Documentation title

Pre minijack drawing

Pre minijack side view right

Side view right
Pre MJ front view

Front view
Pre minijack side veiw left I

Side view left I
Pre minijack side view left

Side view left II


Simple patches with other (CG Products‘) modules

Patch Description Audio

1. Pre & XR22VCO FT

The Pre’s output is connected to the
XR22VCO’s AM input. The oscillator is amplitude-modulating the microphone signal and vice versa (ring modulation with oscillator tone)

Pre In: Microphone with trumpet
XR22 VCO: Different frequency settings


2. Pre & Delay1022

The Pre’s output is connected to the Delay1022 input ‚In1‘.
Delay, phasing and flanging effects.

Pre In: E-guitar
… Delay1022 T CVin: Sinewave Oscillator


3. 2x Pre & X multiplier

Ringmodulation of 2 acoustic signals (from e.g. 2 different microphones, 1 instrument pickup & 1 microphone etc.).

Pre1 In: Microphone with voice…with harmonica
Pre2 In: E-Guitar


4. Pre & PEAK+HOLD

The PEAK+HOLD’s 1/4′ jack input is optimized for higher signal levels coming from pickups mounted on a drum, so a preamp is needed if the P+H module shall be sourced from a microphone.

Pre In: Microphone with voice…with bongos/cymbal
PEAK+HOLD CV outs controlling XR22VCO and Delay1022