| numChannels | 
 the number of channels to output. If 1, mono is returned and pan is ignored.  | 
| trigger | 
 a kr or ar trigger to start a new grain. If ar, grains after the start of the synth are sample accurate.  | 
| dur | 
 size of the grain (in seconds).  | 
| in | 
 the input to granulate  | 
| pan | 
 determines where to pan the output. 
  | 
| envbufnum | 
 the buffer number containing a signal to use for the grain envelope. -1 uses a built-in Hann envelope.  | 
| 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.  | 
| mul | |
| add | 
All args except numChannels and trigger are polled at grain creation time.