So I disconnected the overdrive board and wired the overdrive switch as shown in the diagram. The overdrive switch worked almost as expected.
1. When the overdrive potentiometer is turned past about 9:00 it has an extremely high pitched squeal. There is also a low hum also only when turned past 9:00. While I would expect some noise as the potentiometer is turned up, this comes on suddenly. Moving the wires does not eliminate the noise.
I reconnected the overdrive board as pictured.
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The way I have it hooked up is not the way it is on the overdrive board diagram. The foot switch only works when the overdrive switch on the amp is pulled out. The foot switch then turns off the overdrive. I have no idea why this works, but unless there is an issue with wiring it this way, I’m inclined to leave it.
The presence control seems to be doing something, but it super subtle.
The treble buzz seems To be greatly reduced with wire position. I still find it odd that it only happens when the potentiometer is all the way up.
Would shielded wire make a difference?
Thanks,
Kev