There are LADSPA plugins for many of the csound opcodes. I'm pretty sure buzz and gbuzz are in there.
On Fri, 2002-01-25 at 20:42, Miller Puckette wrote:
HI all,
It's in
Moorer, J. A., "The synthesis of complex audio spectra by means of discrete summation formulae," Journal of the Audio Engineering Society, 24/8, 1976, pp. 717-727.
There are some abstruse bits.