Demand rate geometric series UGen.
See Pgeom for structurally related equivalent.
| start | 
 Start value. Can be a number or any other UGen.  | 
| grow | 
 Value by which to grow (x = x[-1] * grow). Can be a number or any other UGen.  | 
| length | 
 Number of values to create.  | 
The arguments can be a number or any other ugen