It's not so bad using the front panel switch to toggle the on/off on the harmonizer, but I've ordered a 6 button switch anyway. If it comes with a wiring diagram, I'll send it to you. Doesn't the quality of the mic input sound great with the board installed?
Everyone, and everything I listen to is my teacher. Every instrument, every voice, every sound in nature ... they are all my private tutor ... 24/7 for free.