I will have to check which bypass mode is selected. This occurs only when I click the switch off on the H9. When I click it back on everything works fine.

All the outputs and inputs are set to instrument level. The signal is mono in and out. I have used other pedals (overdrives, delays, reverb, etc.) without any problems.

I have a feeling that the internal bypass setting might be the culprit. I will fiddle with it and report back. Thanks for your quick reply.

Lim