A.Since GB4 (and its enhanced file format) didn't exist when GB3 was released, GB3 does not have the ability to open the enhanced format of a GB4 file (Conversely, since GB3 and its file format already existed, GB4 can open GB3 files).
There is no way you can open the GB4 file if you only have GB3.
A friend with GB4 could export every track of the GB4 project and then you could rebuild the project yourself in GB3, that is the only solution to getting all the Audio and MIDI data from a GB4 project into GB3.
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GarageBand from Apple Computer uses audio loops and MIDI loops in Apple Loops format. It can work with Audio Units plug-ins. Apple Macintosh Compatible FireWire and USB interfaces can be used to connect Audio and MIDI instruments to your Mac, and be recorded into GarageBand.
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