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Thanks... I checked all my connections. Each filter is getting signal now. Sound is passing through, but no effect is happening. I substituted a 250k log pot instead of the 150k because that's all I had. Could this have done something to the circuit?

Everything was working fine through a guitar. I tried it through a bass and bass cab. Sound was ok. Next day I tried going back to guitar and all I'm getting is this buzzing sound. The tone comes through fairly loud only on band pass now. The other two are very faint.

Any ideas?

Busted opto coupler?


Thanks in advance.