Mp3, audio or video are stored in different ways by the software.
If I add an mp3 to a playlist then I set pitch and a START position, those setting are stored in the playlist or in the file itself, I don't know. Even if I drag the file in another playlist, I will found the same settings.
Otherwise, if I add a MIDI, there's no way to save muted channel, reverb or other stuff in mixer. Everytime I play the file I need to open the mixer and set everything again.
Would be useful that all those information would be saved in playlist, so I can set a playlist with same files but for different setup. E.G. I have a saxophone player with me then I will mute all solos...
Are you planning to let playlists save mixer settings file by file? Would be a faster solution than export every file. And an better organized solution too, one single file instead of X.
(This helps in case of a single file used in different playlists. E.G. playlist solo, playlist trio, playlist with drummer)