27. port

port is a portamento filter. It is a 1-pole smoothing filter designed to work on control signals. in is the input signal, and htime is known as the "half-time", which controls the smoothing amount (and can be approximately thought of as being in units of seconds). Larger htime means more smoothing.

(define (port in htime)
  (param in)
  (param htime)
  (rvl "port"))

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