100 Grit

Schlappi Engineering

Low Pass Filter, VCA, and Distortion with Brass Touchpoints

The 100 Grit is a touch-controlled distortion unit inspired by the output section of a vintage synthesizer. Sonically it can range from subtle tone shaping to complete sonic obliteration depending on the positions of the knobs and output chosen.

The touchpoints enable touch-controlled resistive patching between the cv points (gain, frequency, and resonance), sensitive points in the distortion circuit, and different distortion outputs for a mix of touch-controlled audio rate modulation and crackle box-like noise freakouts.

A plethora of feedback paths allowing it to operate as a hands-on performance instrument with or without any input.

Tax included
Out of Stock


  • 8 brass touchpoints
  • 2 inputs to transistor core low pass filter
  • Voltage control over frequency, resonance, and gain
  • OTA VCA with soft saturation characteristics
  • Distortion circuit based around a vintage headphone amplifier driven into instability
  • Three position x100 gain switch with off, on, and momentary on settings
  • Each input and cv input is normalled to a different feedback path (6 total)
  • Seperate outputs for the VCA and distortion
  • Can operate as a vintage voiced VCA and LPF or a screaming distortion and noise effect
  • All analog design
  • 14 HP
  • Skiff friendly 25mm depth
  • POWER DRAW: +12V 55mA, -12V 70mA

Data sheet


You might also like