Playlist records are direct shortcuts to registrations. You can have more than one record song setup in an 8 bank registration saved in Playlist

BUT BUT BUT....
ONCE THE REGISTRATION IS LOADED IN PLAYLIST, YOU HAVE TO LET PLAYLIST KNOW THE NAME OF THE SONG, AND THE BANK THAT CONTAINS THE SONG

DO THIS IN PLAYLIST "EDIT" Rename, bank number, then SAVE

Either that, or one song, one Registration