[sdiy] Additive VCO

[jhaible at debitel.net]

> The expo output is normally a current, so it'd probably work better if 
> you mirror it to each VCO and taper the mirror ratio according to the 
> harmonic series. 

That's a really good idea!

You can fine tune (and fine-detune) individual partial oscillators
by applying a small voltage to the base of the respective mirror transitor,
too.

Now use real fast CCO cores to avoid tracking problems. The Korg
thyristor circuit maybe.

JH.

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