ODP: thru zero VCO questions

[Rene Schmitz]

At 11:03 15.09.99 +0200, Roman Sowa wrote:
>And how can one make stable VCO running so high?
>I mean if we want to tune it at, say, 50Hz (afer downconversion)
>and have reasonable stability, it must run at 20050Hz, and no 0.1Hz
>less. It's almost crystal stability...
>Of course, such thing would be used only for deep modulation,
>but how can we tune it anyhow?

I've messed arround with this arrangement, two of my VCO3s, the Ringmod and
then into the filter. It was very difficult to get a constant timbre. I
guess I've tuned then to perhaps 5-8kHz only, the sum-frequency was still
audible.
And difficult to scale as well. I've ended up leaving the two oscillators
at fixed frequencies, instead of scaling them with the exponential inputs. 
If you wan't to scale them exponentially the tuning courve must be very
precise, the slightest deviations between the two oscillators will mess up
the sound.

Bye
 René


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