There are still some things that need sorting:

When I first start the MultiPicker it takes 30 secs to open.
I can't see a rebuild button in the RealTracks it seems to use the Style rebuild that takes ages even if set on "Quick".
How many times do you put this off until you are force to run it:

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Then after waiting 30sec you choose the Drum tab and you have to wait again:

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