Hi,

Is vcf~ (which is bandpass) the only available type of signal-controlled (smoothly-changing) filter? Doesn't the "voltage-controlled" version of lop~ and hip~ exist? Is it for a "mathematical" reason? (i.e. impossibility to implement in a relatively simple way)

Or is it because it is trivial to "build" it in PD? If so, how?

And if not, how would you "approximate" it, that is create in PD something similar to a simple low-pass filter whose cutoff frequency is controlled by a signal?

Attached are some abstractions I once threw together which should be quite similar to the user-friendly ones. Sorry for the very silly help patch -- I hope I haven't made any stupid mistakes.

MB