the Fly Clone Project

Helps if you attach a picture!

I think you might be on the right track, but reading the switch diagram wrong.
Maybe the resolution of your printer has made a few connections where there are none, the top row and bottom of the switch do not connect, they are electrically isolated.
These switches work/connect like below, where the arrow signifies connection.
Two b7's in the bottom row because those two points connected/jumpered in the schematic, so effectively one:

b8 <- b9 b10
b7 <- b7 b6

and

b8 b9 -> b10
b7-- b7 -> b6

so b9 connects to b8 or b10
b7 connects to b6 or not to b6

b7 doesn't connect to b9, b10 doesn't connect to b6

So directly connect:

b7(plug) to b6(vol)
b9(plug) to b10(vol)

...might work. Then there's b8 to wonder about....

Anyway, that's what i reckon!

Well cover me in eggs and flour and bake me for 40 minutes! G.man music had a switch and are mailing it to me! Yes! Hopefully this will sort it.

On another topic, how do you remove the ribbon cable connector from the circuit board?

.... Removing the white cable connector from the board really requires a specialised tool that will heat all the pins/solder at the same time.

Otherwise you could heat bits and slowly prise it off, but i wouldn't recommend that approach.

Why do you want to get the cable connector off?

I was hoping it would just unclipped so I could give it a clean, but if it's soldered then I'll leave it

I wouldn’t touch it; is it not working?

Still awaiting the mono/stereo switch, once that is installed I'll do some continuity checks, see what else has gone wibble