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What power supply are you using? The C9 doesn’t like being daisy chained, try it on a separate supply and see if the issue resolves.
I’m using my C9 on my pedal board. It is first in the chain of 5 pedals. Powered by a Voodoo power unit.
All of the other pedals are noise free. It is only the C9 which is whining. To me it sounds like a design fault. The bypass circuitry should be good enough to filter out any internal noise generation.
Paul
