[sdiy] Design solutions for analog polyphony and/or banks ofVCOs ?

[jbv]

>
> The disadvantage is the (possibly) limited resolution if you want to be
> able to apply voltage control to such a processor controlled oscillator.
> Also you need a pretty good DA to control a linear oscillator precisely.

According to some calculations I did a couple of years ago, a 16 bits DAC
with 64 Kb of Eprom should give enough resolution...


Another question I have is about the risk of having adjacent VCOs lock
to the same freq... Would decoupling be enough to avoid this ?

Last but not least, tuning a bank of VCOs is crucial.
Is there any auto-tune schemo / procedure available somewhere ?
I recall reading somewhere that some poly from the 80's (Seqential I guess)

featured an auto-tune circuitry...

Thanks,
JB