Just go to the practice mode, find a song that you know how to play on the bass, then choose to practice the song on the bass, but pick up your real bass instead. The bass track on the song won't play, so all you'll hear is the guitar(s), vocals, and drums. It's actually more difficult without the bass being played along with the track, and it makes you feel like you're actually a part of the song. Of course, this also means that you only have about 70 songs to choose from, and most of them have an easy bassline, but there's YYZ on there! Imagine keeping up without geddy playing along! Of course, a real band is always more fun, but this is as close as you can get alone at home.
