I wish I could help, but I’m not able to answer this question. I’ve never built my own or studied the schematics in depth. Perhaps this question is best suited for forums like The Gear Page. Maybe another forum user has the answer. From the research I’ve done, I’ve noticed expression pedals with pots wired as rheostats work best, as in the diagram which can be found in this video: https://youtu.be/SXTdMqAWu0o?feature=shared&t=632
