There is a handy method you can use to do this just with the Helix's expression pedal. It simply requires connecting a MIDI cable from the Helix's MIDI out to its MIDI in connection. You are going to leverage a MIDI command using the CC#59 value which acts just like pressing the expression pedal's toe switch when it is sent back into the Helix.The  MIDI command will be assigned to the footswitch you want to use to switch from volume to wah. That way you can use any footswitch you want to switch
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