If you want to hear a few samples of some of the wavetables, go here..
Waverider Digital VCO | Frequency Central
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that's another site that sells modular kits for ED's chips.
The pic he used has only two 8bit ports to configure.. if you make one to be an interface to the HAWK's data bus, that leaves the other port to config. ADC's, timer inputs, etc. from.
Each bit on the ports can be config'd to a fixed list of options.. so only certain pins can be timer ins/outs, ADC's and so on.
If we made one port to listen in on the data bus, we can easily get the data to interact with the PIC's onboard program.
I dont know if you'd want to create a 3bit select out of 3 pins from the other port or how you'd go about to trigger the PIC to capture the data on the bus.. but then you'd only have 5 pins left for the output and ADC's.
He shows a bipolar ADC input interface in his datasheet. so it should be easy to use that form of CV if needed.
If we need a 3rd port to give us another 8bits/pins to work with, I'd recommend the 16F1938
Here is it's datasheet
http://ww1.microchip.com/downloads/en/DeviceDoc/41574B.pdf
Tom's/ED's code should be easily ported over to this chip since it matches the clock, etc. It cost's $3 each.
I did get in touch with Tom about his PIC and the idea to make a poly voice with it.. he said he'd have time to talk after a 3week absence. But I think we can figure out alot of it just by his docs and and other avail. ref's.
~Blaine