Differing waveshapers, many making use of InputOutputCharacteristics along with custom waveforms to shape/distort the input.
Waveforms can be downloaded here. (same as those referenced in the P5 sound)
-- BenPhenix - 17 Oct 2003
had some time to add the file extensions. same link.
tested on my osx machine, please let me know if you still have troubles.
-- BenPhenix - 22 Oct 2003