Logic Pro 9 Chaning the key of a loop

Go into the track inspector, and use the transpose settings. If you select a region, one at a time, you can actually change each one to create a chord progression (if they all work in the same relative key... you can't change an audio file from a major chord to a minor chord... well, you would need to bounce it, and use Melodyne, which can actually do this).
 
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