Hi, I just recorded a live performance with garageband running on my powerbook. I'm starting to think this might not have been the best idea. Garageband seems to have recorded everything fine (sounds great). But it won't let me listen to anything beyond 996 (I don't know the units) on the topmost bar. The purple slider moves to the left, but not to the right. Is there anyway to expand the length of the recording? if there's not, what can I do?