I don’t know why we didn’t think of this sooner… Here’s a hack that emulates an EV-5 Roland Expression Pedal. Just needs a stereo jack output that connects right up to any Boss Expression Input (or Roland product of course). Not only that, but our controller already has a minimum level adjustment like the EV-5. We might want to figure out a simple way to set and hold the pedal, and have previously tested using a quick twist of the foot (using the Z-gyro sensor in the pedal)… add that to the code To-Do list.
Shown is a close up of the wire I soldered to a tiny BROKEN lead off the Digital Pot… as in no lead, just a stub! Obviously it would be a clean connection off the second channel of the chip, but I can’t believe it stayed long enough to test this (why all the tape to hold it). The first channel of course controls the Wah effect. And I might either put in some jumpers to let this be a volume swell, or just create a separate box to simply patch through the audio as a volume controller.