hsc3-0.8: Help/UGen/Trigger/peak.help.lhs
peak trig reset
Outputs the maximum value read at the `trig' input until `reset' is
triggered.
> import Sound.SC3.ID
> let { t = dust 'α' AR 20
> ; r = impulse AR 0.4 0
> ; f = peak t r * 500 + 200 }
> in audition (out 0 (sinOsc AR f 0 * 0.2))