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…

Features:

• 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

Specifications:

• Current draw: 28mA on +12V; 28mA on -12V
• Width: 8HP
• Module depth: 24mm