Astell & Kern AK100 Introductory Manual page 10

 Press the (+) tab and press the (+) within the "Add Playlist"
tab to add the music track to your playlist.
 Option 2: Move to the music file listing of the Astell&Kern and
swipe to the left to bring up the add playlist/delete file menu.
 Press the playlist button (+) to add the music track to your
playlist.
 To access the saved playlist, navigate back to the Music List screen
and press "Playlist" menu to access the saved playlist tracks.
 NOTE: Saved playlists will be named "Playlist 1", "Playlist
2", etc.
o Deleting a song from the playlist
 To delete a song from the playlist of the Astell&Kern, navigate to
the "Play list" menu. Select the song you wish to delete from the
playlist and swipe to the left. Touch the playlist button to release
the song from the playlist.