how to get stems (or splits) when working cross platform.
an audio engineer friend had offered to mix my recordings i'd been making. he is fluent in pro tools, has some great outboard gear, and didn't want to mix in garageband. the only way we could figure to get my loops i'd created into his computer, was to solo each track and one by one export to itunes. try doing this with 15 tracks on a 5 minute song, and you'll soon realize what a waste of time it is.
fast forward to this morning, when a co-worker and i were chatting about what locking tracks does for the performace of playback. we locked every track on a huge file i had (and let it play down). we right clicked on the garageband file, and selected "show package contents", and low and behold, in a folder named "freeze files" were each track bounced as an aif.