class:: GrainIn
summary:: Granulate an input signal
categories:: UGens>Generators>Granular
related:: Classes/GrainSin, Classes/GrainFM, Classes/GrainBuf

classmethods::
private:: categories

method:: ar

argument:: numChannels
the number of channels to output. If 1, mono is returned and pan is ignored.

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

argument:: dur
size of the grain (in seconds).

argument:: in
the input to granulate

argument:: pan
determines where to pan the output.
list::
## If numChannels = 1, no panning is done.
## If numChannels = 2, panning is similar to Pan2.
## If numChannels > 2, pannins is the same as PanAz.
::

argument:: envbufnum
the buffer number containing a signal to use for the grain envelope. -1 uses a built-in Hann envelope.

argument:: maxGrains
the maximum number of overlapping grains that can be used at a given time. This value is set at the UGens init time and can't be modified. Defaults to 512. This can be set lower for more efficient use of memory.

warning:: The above parameter is new (post SC 3.3.1) and has the potential to break code written <= 3.3.1. This parameter is BEFORE the mul slot, and you may need to update code to account for this difference. ::

argument:: mul

argument:: add

discussion:: All args except numChannels and trigger are polled at grain creation time.
instancemethods::
private:: init, argNamesInputsOffset

Examples::
code::
s.boot;

(
var winenv;
// a custom envelope
winenv = Env([0, 1, 0], [0.5, 0.5], [8, -8]);
z = Buffer.sendCollection(s, winenv.discretize, 1);

SynthDef(\in_grain_test, {arg gate = 1, amp = 1, envbuf;
	var pan, env;
	// use mouse x to control panning
	pan = MouseX.kr(-1, 1);
	env = EnvGen.kr(
		Env([0, 1, 0], [1, 1], \sin, 1),
		gate,
		levelScale: amp,
		doneAction: 2);
	Out.ar(0,
		GrainIn.ar(2, Impulse.kr(32), 1, PinkNoise.ar * 0.05, pan, envbuf) * env)
	}).add;

)

// use built-in env
x = Synth(\in_grain_test, [\envbuf, -1])

// switch to the custom env
x.set(\envbuf, z)
x.set(\envbuf, -1);

x.set(\gate, 0);
::

