Thanks Taylor. I have some used wah shells on the way, which I plan to use for several expression pedal applications, so I think I'll have better solution in the future. A resistive pot will be much more responsive. At one point, I was thinking of reusing an old Morley pedal for the Tap Temp Trem... the footprint of the Morley allows for a nice layout of the additional knobs and would make a great all in one Trem pedal. However, Morley's use optical as well, and I'm not sure if the response is fast enough for these type applications (vibe, trem, phaser speed control).