Effect 4: Stepped 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. Cycle the envelope and use the RATE fader for the speed of the modulation. Set the pitch high for a seemingly random character, low for a staircase.

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