It is possible to play multiple songs provided they all reside in the same directory.
Step 1: Load any song from the directory containing multiple songs.
Ctrl
Step 2: Click on the Play button while holding the Ctrl key down. The first song in alphabetic order will start playing followed by the rest of the songs in the directory
The only way to identify which directory to play is to first load a song from that directory
It is also possible to start playing all songs with the Play Directory Songs menu option.