There's a really creative guy called 11Gauge on TDPRI who's posted mods to rewire the SD-1 into some other popular pedals; ZD, OCD, Eternity, etc. Also found a great SD-1>CJOD mod on FSB by analoguru. Good stuff!
Remove C6 and your done !
The C6 mod is a real easy one. There is also a mod that let's you toggle between asymmetrical and symmetrical clipping. This could be quite useful.Just leave the clipping diodes alone and do the rest of the mods then.
The asymmetrical clipping of the SD-1 gives that signature open growl that a TS doesn't really have.