Originally posted by Christoph

According to my experience, Lordofthestrings has it "spot on".

You want to go from the 1/4" headphone jack on your amp to the 1/8" mic jack on your sound card. The "line-out" jack on your amp is powered and will probably fry your sound card's input.

I dont think anybody suggested that,really, Jaz is suggesting sticking a cord into the output of the guitar adapting it and putting it straight into the soundcard... this works fine. The line out jack is usually the signal from the preamp section (i could be wrong here) but this should run at a lower voltage than the output from the headphone socket.. since when did anybody succeed in putting a microphone INTO an output jack and getting a sound? We tried this when we were teenagers -on our dads stereos- and it didn't work.