Originally Posted by Kris Cain
just stick with adobe for starters, until you learn more about mixing, and things like that.
Its a more user friendly program.
Alot of people here speak down on Cool Edit, and Adobe, because they discovered some "bigger, better" DAW, that's not even really that important. focus on learning on how to mix your shit first. Then move on to more advanced methods, and steps.
as for your problem.
Download the MP3, or whatever, open it in adobe audition... and insert it into the multitrack.
then arm track 2 in the multitrack for recording, by hitting the red R, and record yourself on your mic, with headphones plugged in so that the sound wont be coming from your speakers.
if you need a more comprehensive breakdown, check out the tutorials at the top of this forum