I made a rough (very rough) demo with my varislope phaser tonight. It's done with alligator clips all ove rthe board instead of proper panel wiring, but I got some unusual sounds out of it, I think. Not very typical for a phaser: http://www.jhaible.de/varislope_filter_phaser/varislope_unusual.mp3 (First few seconds: Unprocessed input signal. Then all kinds of modulation, mostly sample and hold and self-modulation, high resonance. Towards the end of the clip, input signal is removed, and phaser runs on the edge of self-oscillation. Don't turn it up too loud - danger for your ears and speakers! Everything is modulated with the on-board LFO only!)