KORG PA4X 76 - Manual (Page 179)

Advanced editing of the Sound sets |175
2 Use the Type parameter to choose the polyphony mode.
type Meaning
Drum Drum/Percussion track. This is typically assigned to the Drum and
Percussion tracks of the Accompaniment and MIDI Songs.
Set a Keyboard Sound to Drum mode, if you don’t want it to be trans-
posed (it will behave as a Drum Kit, even if it is an ordinary Sound). Also,
set it to Drum mode if you wish to separately adjust the volume and set a
different output for each percussive family of a Drum Kit.
Drum Kits are never transposed, whichever the type of track they are
assigned to.
This parameter cannot be edited, it the track has already been set to
Drum or Percussion mode in Style Record mode.
Poly Tracks/parts of this kind are polyphonic, meaning they can play more
than one note at the same time.
Mono Tracks/parts of this kind are monophonic, meaning each new note stops
the previous note.
Mono Right A Mono track/part, with priority assigned to the rightmost (highest) note.
Mono Left A Mono track/part, with priority assigned to the leftmost (lowest) note.