The 1986 Peavey Musician Mk III I bought off craigslist in Austin c.2007 did not include the Automix footswitch that came standard with the amp . So finally, with a wiring diagram supplied by Peavey and parts from them and Radio Shack I tried my hand at making one. You can barely see both LEDs on for the first time since I've owned it. Channels switch, reverb on/off, phase on/off, just the way it's supposed to. I needed this little victory, but don't ask me to solder another 6-pin DIN plug for a while.