It is really cheap to implement -- you can use a shift-xor random bit generator to get the blend factor of ½ that they mention. The whole thing was about 10 8086 instructions, as far as I recall (it's been twenty years since I played with it).
Here's a paper with more extensions to the Karplus-Strong algorithm (+ analyses thereof):
The description begins on p.46 of their article:
http://citeseerx.ist.psu.edu/viewdoc/download?doi=10.1.1.144...
It is really cheap to implement -- you can use a shift-xor random bit generator to get the blend factor of ½ that they mention. The whole thing was about 10 8086 instructions, as far as I recall (it's been twenty years since I played with it).
Here's a paper with more extensions to the Karplus-Strong algorithm (+ analyses thereof):
http://www.music.mcgill.ca/~gary/courses/papers/Jaffe-Extens...
Here's an anthology from 1992, which is where I learned about Karplus-Strong:
http://www.amazon.co.uk/Music-Machine-Selected-Readings-Comp...