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Pedal Brainz Left Brain

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Left Brain - Expression Modulator

The Left Brain is a light-controlled expression pedal that interfaces with effects offering expression control.

Over 50 Modez of controllable expression, an expression pattern loop recorder, and a host of other features to harness the potential waiting in your effects pedals. 


  • 3 Control Knobs: Adjust the properties of light patterns and Cycle through modes.
  • EXP/EYE Switch: Choose between manual expression or engage the Eye to add light-headed control.
  • Scale Knob: Variable control of the Maximum expression value.
  • Range Switch (Full/ Less/ Least): Adjusts the Maximum range of the Scale Knob.
  • Tip Direction: Swaps the direction of expression between Tip-Ring and Ring-Tip for greater compatability across effects.
  • TRS 1/4" Jack: Requires TRS (Tip, Ring, Sleeve) between Pedal Brain and effect.
  • DC Jack: Tip Negative, Sleeve Positive.
  • USB Jack: For accessing the internal Adafruit Gemma M0 platform.