Korg Pa4X User Manual page 858

844| Global settings and preferences
Showing/Hiding the track's activity
You can turn on/off the Track Activity display. When it is turned on, you
can monitor events coming from the internal Sounds or the MIDI messages.
Incoming events are shown by the color changing on each track's label.
1 Go to the Global > General Controls > Interface
2 Select/deselect the Track Activity > Show
page.
checkbox.