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I will post fotos later.
When I say silibance I mean a kind of pure 3.5KHz tone.
It's continuous and happens with a power  supply and with 9v batteries.
Thanks.

Hello.
I've bought a Disdis kit at musikkind.
Now that I have mounted it I have a 3,5khz silibance when the pedal is turned on.
Do you have any idea of what it could be.
Thanks a lot.