I am a metal guitar player.  I like a heavily
saturated guitar tone. Could
 someone point me in the right direction for processing a clean guitar signal
 in real-time such that it can (even partially - i like weird sounding stuff)
 emulate tube circuitry.  I am thinking a chain of LADSPA plug-ins would do
 the job.  The sound im looking for doesn't have to emulate anything to a T,
 it just has to be raunchy (think Nine Inch Nails - Broken, or any Nine Inch
 Nails album for that matter). 
i reckon you should run your axe through jack rack using the steve's swh
ladspa plugs
cheers
matthew