It is easy to do. I have a master 2 back home in Kansas. There was an
article in qst about a controler that worked well. I'm not sure I have
the web page any more. Let me go see.
Basicly they had two versions of the controler, one was built in a
separate box and the other version, available only from them preassembled
as I recall, fit right inside the master two across the front where the
tone boards went.
I can't find that page any more. I'll do some digging. They sold a kit
or just the board, but this has been 3 or 4 years ago. I'll keep digging.
73s
Butch Bussen
wa0vjr