Karplus-Strong (“plucked string”) algorithm setup
This initializes a simple Karplus-Strong filter/generator (pluck). See the documentation for hplset for more information (and a better implementation).
From the source code:
void pluckset(float xlp, float amp, float seed, float c, float *q, float sr)
The source code for the STRUM instrument contains much better plucked-string algorithms. This ugen is as old as the hills.