It was originally adapted from Perry Cook and Gary Scavone's STK, the Synthesis ToolKit for doing amazing physical model stuff.
Here's what Perry says about "Brass":
/* MSITAR - the "Sitar" physical model instrument in Perry Cook/Gary Scavone's "stk" (synthesis tookkit). p0 = output start time p1 = duration p2 = amplitude multiplier p3 = frequency (Hz) p4 = pluck amp (0.0-1.0) p5 = percent of signal to left output channel [optional, default is .5] Assumes function table 1 is amplitude curve for the note. Or you can just call setline. If no setline or function table 1, uses flat curve. */Sample scorefile:
rtsetparams(44100, 2) load("MSITAR") makegen(1, 24, 1000, 0,1, 1,1) MSITAR(0, 3.5, 10000, cpspch(8.00), 0.9) MSITAR(4, 3.5, 10000, cpspch(8.07), 0.9)