A subset of MIDI Mode #4 (see WFTD archive MIDI Mode) that determines which notes sounds if many are played on a synthesizer set up for MIDI mode #4 (i.e. to play monophonically). When more than one note is played on a monophonic synthesizer, only the lowest note will sound. The lowest note has priority over the other notes. In some synthesizers this priority can be changed to highest note played or to last note played, but many default to Low Note Priority.