[sdiy] filtering cv

[Byron G. Jacquot]

> thanks for all the replies. so i guess the self-oscillation would add
> a sine wave pitch modulation related in speed to the lag time set by
> the cutoff. i still can't visualize the effect as resonance is swept
> from zero up, going from simple lag to the addition of a sine wave.
> i'll have to find a way to try it out.


If the filter cutoff were significantly low (like in the 1 Hz or 
lower region), and you had some (but not self-oscillation) resonance, 
filtering a pitch CV, the result would be that when the CV stepped, 
the output would overshoot, then undershoot repeatedly, and finally 
settle on the new voltage.

Portamento with a very bad sense of where to stop...

The number of overshoot/undershoot cycles would depend on the 
resonance setting.

Higher cutoffs would probably result in a noisy burst of FM when the 
CV changed.

Byron Jacquot