Duocast hum when bypassed

marmot24

New member
I have a PedalPCB Duocast which is having some issues. It sounds great when engaged but has an awful hum when the switch is in bypass. I figure it’s a grounding issue, but I can’t figure out where the problem is. I looked over the solder joints and couldn’t immediately see any problems. The switch uses the PedalPCB breakout board.

Any suggestions on where to troubleshoot?
 

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