PJS

I had a problem on a different FV-1 pedal once where it would work fine on the internal programs but not external. The pins on the FV-1...

If the rate LED is steady then the LFO is not running. Look around there to see for wrong components etc. Also check the voltages on...

Pin 1 and pin 2 of both ICs should be the same, and should be sitting at 4.5V. It should be biased at that voltage by the 1M resistor...

I know from experience that those TRACO modules can take a fair bit of abuse and survive, so there is a good chance it is fine. I have...

And the full successful answer seems to be: 2.2M resistor from input to ground on the DI circuit. C2 becomes 220nF film cap, R6...