This is a clone of David Rolo’s Twin Peaks Tap Tempo Harmonic Tremolo. Instead of two PCBs sandwiched together, it is one board. It fits in a 1590BB, rotated, with 4 knobs on top, and 3 on bottom.
Circuit designed by David Rolo
Layout designed by delyk PCBs
Permission to sell PCBs granted by Mr. Rolo