Kawai MR210 Owner's Manual page 7

There are three demo songs stored in the keyboard's internal memory.
Using the following method you can listen to an automatic recital of these songs.
(1) Press the DEMO button.
1 2 3 += EA]
9 @ @ @
f——— REVERB ————-1
il o DEE i
ROOM STAGE HALL DEMO
The three demo songs will play automatically one after another and repeat until
stopped.
A ( Demo Song 1 `
4 Demo Song 3 N
(2) You can select the specific song or songs to be played by holding down
the song's number key while pressing the DEMO button.
The selected song(s} will play repetitively.
1 2 3 AAA
O @ e @
m~~ REVERB ————]
E | ae E
ROOM STAGE | HALL DEMO
In the above example Demo songs 2 and 3 will be played repetitively.
(3) Pressing the DEMO button again stops the demo song.