So, I've got a build or two that I'd like to include a lowpass filter on.
I want steeper than the usual cap to ground (6dB per octave?), but I'm not necessarily sure exactly how much. I'd like to be able to vary the cutoff frequency from high enough to not be too apparant, to pretty muffled, and I'd like to be able to do it with one pot. Preferably a single pot, but maybe a double if there's no other way.
I don't mind reading/searching, but I know there's a bunch of different active filter topologies and I don't know the names. Is there a setup or two that could do what I want, or am I asking the impossible? Even a suggestion of something sort of in the ballpark would be appreciated so I can look into it. I'm hoping for 1/2 to a whole dual op amp, and will be using it in an effect or two thats run at +/- 12 or 15V if that helps at all.
Thanks!