http://depot.javispedro.com/nit/64/pa64.so

A "test" sound plugin -- drop it into /usr/lib/mupen64plugins, enable it via config dialog and play some game.
To me it sounds as bad as the original one.

This plugin removes most of the sound logic and just streams directly to pulseaudio but, unlike notaz's, this one also removes the builtin resampler (pulseaudio would resample either way...).

EDIT: Mostly useless, same effect can be obtained by just setting the LOW_BUFFER_LOAD_LEVEL and HIGH_BUFFER_LOAD_LEVEL to ridiculously high values...