129. swell

swell is an special kind of smoothing filter that changes it's smoothing amount based on what direction the input signal in is going in. Upwards direction smooths at a, downwards direction smooths at b. The change from a to b is determined by the inertia amount.

(define (swell in a b inertia)
  (param in)
  (param a)
  (param b)
  (param inertia)
  (rvl "swell"))

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