an open-source digital signal processing and sound synthesis language
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some wort of weird Karplus-Strong variant

Jeez, I have no real clue what this code does. It looks like it's missing a setup function, and no, it doesn't do a block-computing version of pluck. It probably dates back to the mid-1980's (or earlier).

From the source code:

float bpluck(float xin, float *q)