#lang scribble/manual
@(require (for-label racket))

@title{(free-self src)}


free enclosing synth when the input signal `src' crosses from
non-positive to positive.


@racketblock[
(audition 
 (mrg2 (free-self (mouse-x kr -1 1 0 0.1))
       (out 0 (mul (sin-osc ar 440 0) 0.1))))
]