Dual Foot Controlled Expression Module

The MST Expressor allows you to use expression pedals with your modular, taking a "hands-off" approach to expand your control and creativity. It has two identical powered expression pedal processing units in one handy module, allowing you to do things such as:

  • Control volume with your foot
  • Attenuate CV or audio if no expression pedal is plugged in
  • Add positive or negative voltage with the flick of an ankle:

    • Sweep a filter cutoff
    • Transpose CV
    • Pitch bend
    • Direct audio volume control
    • Attenuate and expand external CV
    • LFO rate adjustment
    • Modulation amount control
    • And more...


  • Processes audio and DC signals
  • Two discreet expression pedal input channels (1/4" TRS jacks)
  • External signal (audio or CV) input per channel
  • Precise output adjustment: attenuator/scale control per channel
  • 3-position switch select of +5V, -5V or 0V (mute) per channel
  • External input bypasses the switch voltage (the switch voltage and external input are not active at the same time, i.e. the voltage will not offset your input signal.)
  • Red/green LED per channel (red = positive voltage, green = negative voltage)
  • Compatible with passive TRS 1/4" expression pedals, such as the M-Audio EX-P


  • 28 mA +12V
  • 28 mA -12V
  • 0 mA 5V
  • 24 mm deep
  • Ø 3.67 (3 Votes) Average Rating

Available as an assembled Module and as a DIY project.

No info about availability.

$125 Price in € submitted Apr 27th 2015, 22:58 by synthrotek | last Change Mar 3rd 2016, 23:45 by synthrotek
Specs are approved by the manufacturer