It also can be slow if you are synchronize incompatible formats like MPEG Audio as I have noticed that MP4 is based on MPEG 4 and MP3 on MPEG LA.
This app may take a LONG time to run and you might have to wait till it finns everything. After it is all said and done, you can look at folders \ Music (on PC) or \ FooBar (on Phone) and everything should be fine and have been updated.
I hope you've had 50e0806aeb bulkadd
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