By Bollockser I don’t trust Garageband to record live audio without giving me the damned “Disk Is Too Slow” error, even with loads of RAM and a brand new SSD.
Thus, I record with a little 3rd party app, and then drag and drop my sound files into garageband to mix them and apply effects and export the whole thing as a single sound file.
In iLife 11 and previous versions of GB, when I drag and drop an audio file into a track in garageband, I could butt each track up against the beginning of the file – thus, the beginning of each track was in perfect alignment at 0:00.
LO AND BEHOLD Apple threw me a loop when I upgraded to Garageband X: when I drag and drop sound files into a garageband track, they will now go back before they playhead and you can push them into negative time.
NO GOOD. I need each track in perfect sync.
HOW DO I SNAP TO THE BEGINING OF THE DOCUMENT AT 0:00?

Source: MacRumours