I think this is not possible at the moment (version 3.0.6132) to synchronize playlists on an memory card used in an android (thus using unix path) device. The simplest way to be to do this, imho, will be to support unix character (/) specified in "path prefix for tracks" field with "use relative file paths" checked and using the same folder for playlists and music (Music by default).
It doesn't work today because :
- without using relative paths, paths are all prefixed by / and the android device doesn't find the music because the generated path in the playlist is like /Music/Something instead of the real path on the device /sdcard1/Music/Something
- with relative paths checked, the entered path prefix for tracks is then ignored and the default Windows path separator is then used. Exemple : .\Music\Something instead of ./Music/Something