I think that writing an a-rate freq-cutoff version of csound filter should be a quite
trivial job. Maybe I will do this in the future, because I'm curious about the sounds that
can be produced. Are you sure that they are interesting?

Sean Costello wrote:

 
> P.S.  Can any of the Csound filters be modulated by an a-rate signal,
> instead of a k-rate signal?  Some of my favorite sounds come from
> audio-rate modulation of the cutoff frequency of a resonant filter.
> Aphex Twin, for example, runs his drums through the filtering section of
> a Korg MS-20, which is a Sallen-Key highpass and a Sallen-Key lowpass
> filter in series, with independent cutoff for each; often, at least one
> of the filtering sections will be modulated by the input signal. I know
> I could just set the k-rate to be identical to the a-rate, but that
> would really slow things down.  Any advice?

-- 
Gabriel Maldonado