Duck Box not quacking

Iceman53

Member
My Duck Box no longer quacks. It's now more of a huge bass boost. Someone borrowed it a while back and I didn't try it when I got it back. I can't imagine him 'blowing it up' somehow. I replaced both op amps. Still doesn't work. So I re-soldered a bunch of joints. Still no quack. Any clue as to where to start troubleshooting the circuit is appreciated.
 
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