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Dubstep and drum and bass are forms of electronic music which employs frequent use of LFOs, often synchronized to the tempo of the track, for bass sounds that have a "wobble" effect, for example by modulating the cutoff frequency of a low-pass filter to create a distinctive opening-and-closing effect.
The footswitch can be programmed to momentarily change patches, or change one of several patch parameters: filter cutoff frequency, envelope amount or attack; VCA decay or release; voice volume (the momentary value of any of the preceding being user-defined); chorus on/off, or portamento on/off.