DJ Twist & Burn can't record sounds. You'll want to look at our Mixcraft 3 software. It has beatmatching and key matching capabilities and it can record from Line In or Microphone. Mixcraft 3 isn't finished yet, but you can try a beta version of it on Acoustica's beta page
"Beta" means it's not finished yet and that it's still being tested, so there may be bugs. Also, we haven't written the help file yet.