Effect 5: Audio-Modulated Filter

Plug an external audio source into INPUT and bring up the INPUT fader. Effect set-up from the manual: DRONE mode, LP filter, minimal resonance, CUTOFF fader all the way up. Bring up POP to hear the oscillator's PULSE affect the filter; ENV into PWM animates it. Then turn POP down and use TRI into the filter MOD with its fader. Bring up RESONANCE, and DYNAMICS into the pitch MOD gives even crazier effects. Control the oscillator from the sequencer or MIDI.

Source: Softpop SP2 manual (Bastl Instruments), Effect Patch Ideas, page 44.