Here are images of the teardown:

A couple of things to note: I over heated the pads when removing the gain pot and lifted a trace by accident. Instead of soldering directly into the lug hole, I just tied directly to the resistor that is in series with the pot signal.

I also am also not going to be able to use the digital pot I have been working with so far. Note the image that shows the pot with a resistance of 50k, and the one I’ve been working with is 10k.

I’m going to order a pair of these, and many of these to try and solve the bluetooth static problem.