Turn microphone on, check tuning, adjust the sensitivity, press play, hit the notes in timing with the song. Jam on!
Watch plays the riff for you. Practice stops at every note and waits until it hears you play it on your guitar, then moves on. Perform keeps tempo and scores the notes it hears. Practice and Perform use your microphone. Turn on Guide audio to hear the reference, but use headphones so the mic doesn't pick it up. Space plays and pauses.