Another update.

Problem solved.

The lack of sound was due to a broken track on the piece of circuit board around the stomp switch.

And sure enough, the hike in volume between bypass and effect is too much to live with. I’ve simply added a trim pot between the effect out side of the main board and the switch.

Many thanks for the quick response

Point taken about the peaks and resonance. Compression was an option I’d considered suggesting to him. But apparently the volume shift is enormous. The owner of the pedal is a bass player. I can see that using a compressor to try ironing out large shifts in volume could have an unwanted effect on his overall sound.

As I said in my post, I haven’t had chance to try the pedal for myself to see just how bad the problem is. I plan to do that tonight…

I should add that I have an original Bassballs, and I’ve never had any problems with the overall volume changing between “clean” and “effect”.

Paul.