It's something entirely different.
Rocksmith has the ENTIRE track, all of it, like what you'd buy from iTunes or whatever.
It then lets you play over the track with your own guitar.
It does, however, include something to show you what notes to play, and has info on a setup to get key tones for the specific song.
I wonder if that's a MIDI, or another sequencing file...
Anyway, yeah.
But Rocksmith does include a 3/4-Inch to USB cord though, which I've used a few times with my PC to record guitar tracks, but it's nothing professional, and sounds sort of muffled even with a quite high-quality guitar.
The files from the original disc for Xbox360 are m4a, but I think the PC one's are lossless, having more computing power/room.
I have the game beat, and that's all I could find for it.
I did see some settings for vocal volume when I plugged in a mic for later use on Rockband 3, but never explored that.