[PD] No "voltage-controlled" lowpass filter?

[Matteo Sisti Sette]

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?

thanks
m.

P.S. of course I'm talking about PD Vanilla...
-- 
Matteo Sisti Sette
matteosistisette at gmail.com
http://www.matteosistisette.com