A. No, there are no “tracks” in a mixed recording, there is a Left Channel and a Right Channel in a stereo recording, and a single channel in a mono recording. Once all the parts are mixed, you can not remove one instrument. It's like mixing Blue and Yellow paint and then trying to separate the two colours, or baking a cake and trying to get the flour back.
You can not use GarageBand, or any other consumer software to do this. ( In a stereo recording vocals can often be reduced significantly due to the manner in which Stereo recordings are often panned)
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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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