Problem: I have a Roland SE-70 effects box and a Lexicon Vortex effects box, both of which take an expression pedal input. I also have an Ernie Ball volume pedal that I would like to use on my pedalboard to control the SE-70 and the Vortex. The plan is to have a microcontroller reading the volume pedal and controlling one digital potentiometer for each effects box. If that works, I'll add a wireless link in the next version.