Just finished the second board for the Pro-one project. This one contains the oscillator mixer, a modified noise circuit, a sample and hold part and the output buffer. There are so many ins and outs on the upper part of this card that I couldn't find room for the top right screw hole... Oh well.
I think it will take at least two more boards, perhaps three, to get all the necessary circuitry in place. And that excludes the front panel that will hold the pots and switches, and any output boards.