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.  | 
| azimuth | 
 In radians, -pi to pi.  | 
| elevation | 
 In radians, -0.5pi, to +0.5pi.  | 
| rho | 
 The speaker radius; 1 places shound at the radius, <1 within the radius, >1 is outside the radius. Beyond the radius, nothing happens.  | 
| wComp | 
 Chooses how the W channels is scaled. If 0, a scaler of 0.707 is used. If 1, W is varied according to the scaling of the X, Y and Z channels. 0 is the default.  | 
| mul | |
| add |