Extension| 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. Polled at creation time.  | 
| freq | 
 The freq of the grain generators internal oscillator. Polled at creation time.  | 
| envbuf | 
 A buffer with a stored signal to be used for the envelope of the grain.  | 
| mul | |
| add |