The CDoD uses transistor avalanche oscillators. These can be given a sort of quick and dirty form of voltage control as in the 2000 MEGADRONE 10 OSCILLATOR. This wouldn’t be accurate 1 V/oct CV though. You can also make an avalanche oscillator with a more sophisticated CV, see here:
But that is a very substantial addition to the circuit.
Really, if you want a multi-oscillator drone you can control in a kind of rough way with the M-32 CV, building the 2000 Megadrone would probably be easier than trying to mod the CDoD, and if you want to add oscillators that can play accurately in tune with one another, then it’s best to start looking at the 1222 Performance VCO or other VCOs you can find out there.