How have you been trying to manage your music? I have made a music section in my library and pointed at it my music folder on the computer. This seems to work, though admittedly I haven’t tested it extensively. The iTunes plugin doesn’t work so that route is not the way to go.
You have a mac with itunes and an appletv why not just use itunes & homesharing to manage/play you music for the time being?
Well iTunes does not allow OGG, APE and a lot of losseles audio .
I have not tried iTunes on plexconnect , it works nice alone, you can play full albums or manage list , but forget about other audio than mp3 , mp4 or apple audio formats.