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Phase-inverted buffer FTW! No more squeal. Thanks, everyone!

On my test rig, a Cornish or JHS buffer circuit placed before the Plumes makes the squeal worse. But a buffer pedal (with same JHS circuit inside, powered by the same source) placed in front of the test rig fixes the squeal. What does that mean? Maybe boxing this thing would take care of it.

Thanks, Willybomb. I recently built a Cornish buffer, so I'm going to try that. The Plumes already has a 1M pulldown resistor on the board.

I have also built 2 different Plumes layouts (tagboardeffects and effectslayouts) that both squeal - and tried the usual fixes as well. Placing a 1n cap from input to ground reduced the squeal, but now I just get a lower frequency squeal when volume and gain are in the higher ranges. The issue is much more pronounced with the bridge (humbucker) pickup. The circuit sounds so good that I really want to get ths figured out and box these things. Still working on it...