I have been working on this bit by bit over quite a while on breadboards, and with a few home made toner transfer boards.
Then i decided to build a modular synthesizer for my studio with some bought and some DIY modules (there will be a couple more arduino ones as well). and decided to use this as an oscillator, as well as a more traditional analog.
I have bought a few ICs, and other components for it but none of them are very rare or expensive.
This board was made with ExpressPCB. I had 4 of them made, and each one also has 4 header boards (they go between the MUX and the potentiometer boards) and an extra tiny 4 pole filter board which i put there because my friend wants a subwoofer crossover.
The little boards have to be cut off, but i rigged my lathe with a small slitting saw to make accurate cuts.(the one in the pic already has that part removed)
That is correct except with modulation, each voice can be playing a different wavetable depending on velocity, envelope, accent, randome, notenumber, Midi clock, and whetever else i can think of.
It is not 4 voice polyphonic (it could be with a different sketch) this version is "4 oscillator monophonic, with 303 type linear glide". it is designed to be a bass voice with a lot of expression available.
The wavetables are arranged in 64 sets of 16 evolving sets, in a simple non modulated voice it could scan from the first wave to the last one in a set as time progresses after a note is played. because there are only 16 waves per set, it can do a bit of semi random (lookup table actually) granular mixing to make the transition smoother and longer. (or deliberately not!)
The wavetables themselves came from various sources. some are home made, some came from PPG wave, avrx, waldorf and wiard, and various other places i could find any