[sdiy] non-resonant low and highpass circuits?

[mmanard at columbus.rr.com]

Newb question.
I've been looking around today for some basic non-resonant low and high pass circuits and found a ton, but nothing with sweepable frequency. I want to add a simple low and high pass in and out to my noise module like the moog and the oakley had. Any suggestions, links or schematics?

- Michael nil-x
- Pressure : Penetration