Well, I would have to rerecord the vocals, bass, guitars (Bass and drums are MIDI, so those are fine).
There's just so many annoying things I find. E.g., say your project switches to 150bpm on bar 1, and stays on that tempo for 10 beats, when it switches to 120bpm. Then you decide you want to copy a part from beat 5-8 after beat 20. Well, because the tempo track message for 150bpm exists at the beginning of beat 1, what you're actually copying (beat 5-8) doesn't contain that message. So, you're pasting it after beat 20 and Sonar (and Cubase to my knowledge) don't realize that it's pastes 150bpm audio into a 120bpm section. Total mismatch of MIDI and audio, and you have to manually repair by adding a speed event at bar 20.
rumborak