[linux-audio-user] guitar effects, distortion, amp simulation

Hello! I connect my active guitar directly to my soundcard line in plug and get a great clean guitar sound. This way I can easily apply nice effects to the guitar sound. I haven't found a really great distortion effect though. Does anybody know where to get one? On http://plugin.org.uk/ladspa-swh/docs/ladspa-swh.html and http://www.ladspa.org/cmt there are some distortion effects, but I can't manage to get a great sound with them. Perhaps somebody knows the proper plugin parameters to use? The sound may not be really great because I don't use any amplifier or box simulation. How exactly do these simulations work? Where can I get them for Linux? If at all possible in form of a LADSPA plugin. Thanks for your help. ra