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How to use Expression to control the knobs on Iridium?

You can set the EXP jack on Iridium to accept an expression pedal for real-time control over any one or more of the knobs on Iridium in any direction.

To set the EXP jack to Expression mode:

  • Press and hold down the FAV footswitch while connecting power to the pedal.
    • Once both LEDs on the pedal flash, release the footswitch.
  • Turn the LEVEL knob counter-clockwise and the ON LED will light up GREEN to indicate Expression mode.
  • Press the ON or FAV footswitch to exit and store the EXP jack setting.

NOTE: EXP jack assignment persists through power cycles.


To assign knobs to be controlled with the expression pedal:

  1. Connect an expression pedal to the EXP jack of Iridium using a TRS cable.
  2. Press and hold down both footswitches until BOTH LEDs blink GREEN.
  3. Set the knob(s) you would like to control to the desired settings for the HEEL position of the expression pedal.  The FAV LED will turn RED.
  4. Now, rock the expression pedal to the TOE position.  Now, only the ON LED will blink GREEN.
  5. Set the knob(s) you would like to control to the desired position you would like for the TOE position of the expression pedal.  The ON LED will turn RED.
  6. When you are done, press either of the ON or FAV footswitches to save this assignment.

NOTE: Expression pedal assignment is saved independently per Favorite/MIDI preset.