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

@title{(in-trig num-channels bus)}


Generate a trigger anytime a bus is set.

Any time the bus is "touched" ie. has its value set (using "/c_set"
etc.), a single impulse trigger will be generated.  Its amplitude
is the value that the bus was set to.

Run an oscillator with the trigger at bus 10.


@racketblock[
(let* ((t (in-trig 1 10))
       (p (env-perc 0.01 1 1 (list -4 -4)))
       (e (env-gen kr t t 0 1 do-nothing p))
       (f (mul-add (latch t t) 440 880)))
  (audition (out 0 (mul (sin-osc ar f 0) e))))
]

Set bus 10.


@racketblock[
(with-sc3 
 (lambda (fd) 
   (send fd (c-set1 10 0.5))))
]