One of the new features in version 11 is that you can now split stereo files into stems with out leaving Logic Pro. Useful if you want to create a remix or re-mix an old demo, or even for using elements of a demo you recorded on your phone In your Logic Project. Stem Splitter breaks the stereo File down into 4 main tracks, and this tutorial explains what they are and how they sound plus discusses some examples in how you could use Stem Splitter with some other Logic Features.
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See the tutorial on useing Adapt tempo when importing a file