3. How to switch songs between folders/albums/artists/genre?

A: Please go to "Play settings>Play through folders" and set it "on". Then when X3MKIII finishes the songs from a folder/album/artist/genre, it will automatically switch to songs in the next folder/album/artist/genre. 

If it doesn't work, please check the play mode in the play settings. "Play through folders” doesn't apply to "play single track and stop" and "Loop single song" mode.