I'm trying to mix two songs together in garageband. I have one playing(purple track, follow tempo and pitch checked), then I have the tempo changing from 170 to 160, then I have a regular orange track(160 bpm) starting. It sounds fine in Garageband, but when I export it to iTunes, the orange track comes in late. Additionally, the first second of the first track randomly blares in a few seconds later. I've tried making multiple projects and trying this same thing but the result is the same.