Or Get It As Part of Vulpus Labs S-Series 1-4

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Swirl is a polyphonic source-of-chaos which emits two correlated randomly-drifting values per polyphonic channel.

This can be useful for introducing variance between and movement within voices in a polyphonic synth, for example by patching the first value so that it modulates the pitch of an oscillator, and the second so that it modulates the resonant frequency of a filter.

Swirl has a second mode in which it acts as a polyphonic wave-shaper, which combines wave-folding and ring modulation-like effects.

In both modes, Swirl draws pretty multi-coloured plots in its visual scope, showing you what it's doing.