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

@title{(grain-sin nc tr dur freq pan envbuf)}

Granular synthesis with sine tones

nc - the number of channels to output. If 1, mono is returned and
     pan is ignored.

tr - a kr or ar trigger to start a new grain. If ar, grains after
     the start of the synth are sample accurate.

The following args are polled at grain creation time

dur - size of the grain.

freq - the input to granulate

pan - a value from -1 to 1. Determines where to pan the output in
      the same manner as pan-az.

envbuf - the buffer number containing a singal to use for the grain
         envelope. -1 uses a built-in Hanning envelope.

(let* ((x (mouse-x kr -0.5 0.5 0 0.1))
       (y (mouse-y kr 0 400 0 0.1))
       (n (white-noise kr))
       (f (add 440 (mul n y)))
       (t (impulse kr 10 0)))
  (audition (out 0 (mul (grain-sin 2 t 0.1 f x -1) 0.1))))