i've been having trouble with my rig recently and im not sure what the problem is. Whenever i use my pedals (Dunlop crybaby classic and behringer compressor sustainer) with my amp (Peavey vyper 15 combo) one of two things happens. 1. no sound comes out or 2. there is nothing but a high pitched squeel.

Can anyone help me with this?
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Does it happen with both pedals or just one? Are they both on while this happens? Are you using batteries or a power supply?
have you tired different cables? pickups? guitars? power supplies? batterys? the pedals through another amp? guitar through another amp?

it is all about isolation, control the experiment, and you will find it.
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the cables work its just when i plug in any pedal it doesnt work and i use batteries
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