rsc3/doc/help/ugen/controls/latch.help.scrbl

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

@title{(latch in trig)}


Sample and hold. Holds input signal value when triggered.

in   - input signal.
trig - trigger. The trigger can be any signal. A trigger happens when the
       signal changes from non-positive to positive.


@racketblock[
(audition
 (out 0 (mul (blip ar (mul-add (latch (white-noise ar) (impulse ar 9 0)) 
			       400 500) 4) 
	     0.2)))
]

The above is just meant as example. lf-noise0 is a faster way to
generate random steps :


@racketblock[
(audition
 (out 0 (mul (blip ar (mul-add (lf-noise0 kr 9) 400 500) 4) 0.2)))
]

http://create.ucsb.edu/pipermail/sc-users/2006-December/029991.html


@racketblock[
(let* ((n0 (mul-add (lf-noise2 kr 8) 200 300))
       (n1 (mul-add (lf-noise2 kr 3) 10 20))
       (s  (blip ar n0 n1))
       (x  (mouse-x kr 1000 (mul sample-rate 0.1) 1 0.1)))
  (audition
   (out 0 (latch s (impulse ar x 0)))))
]