Uh oh – I may have the same problem. Everything went great with the build 🙂 However, when I tested with an amp, I noticed the green LED stayed fully lit regardless of any settings, and I was not getting any tremolo effect. After fooling around with all the controls, I noticed a correlation between the Depth control and the green LED. I could get everything working only when the Depth control was between approximately 10:00 and 2:00. The signal still drops out through that range, but re-engages with some small Depth knob wiggles. And when it’s working, all of the other knobs and toggles operate as expected.
I reflowed the solder to the Depth pot, adjusted the paper barrier, and made sure the ground wire from the tab to the board was in good shape.
My unit is ZD3773, and it has the MIDI option (which I have not properly tested, yet).
Do you think it’s the microcontroller? (I’m also on a Mac, so re-flashing doesn’t appear to be an option.)
Thanks!
Grady