#1
thers 2 downloadible softwares that i know of....kristal...and reaper. which 1 is better, and how do u run it from an amp to the computer to record?
#2
i use kristal and its pretty good(especially since its free). i just use my effects processor (toneworks AX1500G). you take a guitar cable and put a line in jack over it (you can find these on the end of big headphones, like ones from the 80s). then i stick that on the end of the cable from the processor the the comp(mic input slot) and record.
GAS LIST

Z.Vex SHO
AnalogMan Stereo Chorus
Barber Tone Press
Way Huge Supa Puss
#3
I think Reaper is a lot better. Just consider that it is still under development and updates are posted regularly. Kristal is no longer supported I think (or at least updated). And Kristal cannot handle midi, soundfonts and all that jazz.

The easiest way to run your amp into the computer would be via a microphone plugged into the line in jack of your sound card. Or you could buy an interface (Line 6 Toneport) and forget about the amp.

Good luck!