I have both Sansa Clip+ and Sansa Clip Jam. I love Sansa Clip+, and I would like to love Clip Jam, but I miss one feature. In Sansa Clip+ I could navigate through the Music -> Folders -> Audiobooks or Podcasts menu and open files in book mode, with all the features of books (ability to change speed, ability to remember last position). In Clip Jam if I open file through Folders, it gets opened as a song, and if I open the same file though Books menu, it gets opened as a book (using data from ID3 tags, I think).
Sorting of books does not work the way I would like, because Clip Jam does not take into account TPOS ID3 tag.
id3info file.mp3 ... === TRCK (Track number/Position in set): 3/4 === TPOS (Part of a set): 2/3 ..
I would like the order to be 1-1, 1-2, 2-1, 2-2, 2-3, 2-4, 3-1, 3-2
Now it seems that it may be, for example, 1-1, 3-1, 2-1, 2-2, 3-2, 2-3, 2-4 (depending on the title)