I love this thread. I recently was frustrated that you can't do a toe switch expression pedal setup with Helix so I gutted a old wha and then decided to go nuts with it. Basically, I turned it into a actual midi expression pedal. Give 9V and a midi connection to the Helix (or any midi capable device) and I now have expression with a toe switch. Since I based the circuit around a RFDuino that meant I also had access to BLE so I went even crazier and built an iOS app so I can change the midi channels and the CC #s via my phone. I have not added up parts cost or time, but it was a really fun project so worth it either way.
I'm really impressed with the thought that went into the Helix overall, this was just a nit on my part.
