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First, it seems impossible to unmark a track using jEmplode.

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jEmplode has always had issues updating the dynamic data partition for some reason. I actually am not able to do this in Emplode either. It's unclear whether it used to work and then jEmplode somehow corrupted things or if there is some more fundamental problem. Not sure.

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Second, it would be nice if I could import multiple tracks without having to create a new playlist.

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I could probably make the import tunes file dialog multiple select ... Not sure why it isn't, actually. Maybe it is?