Hi CS, I’ve been trawling through t’Interwebs looking for resources on this. I found some interesting stuff here: http://handmademusicclubhouse.com/ph...ams-schematics
which outlines some basics, and does include one reference to wiring in a pre amp. I’ve been looking for some alternatives on the on board, but so far coming up empty on a standard unit that satisfies my idea to edge mount it. I’ve got a couple of options to consider that might be modifiable to do what I want.