Hey Rufus,
Here you go, the pics as requested, he just added a pot and two wires and the pot on the far LEFT which is my new master knob and the wires run from the mid lug of the treble pot to the right lug of the master pot, then the middle lug of the master pot to the board, he disconnected something from some where on the board to hook the one line up but I don't remember exactly which but if you know about this stuff it'll make perfect sense! Total piece of cake all things considered!
Let me know if this is what you need.
Dallas