Kawai MR210 Owner's Manual page 6

MR210 has a dual mode which can play two preset sounds at the same time. The result is a timbre and
effect that is not obtainable with only one preset sound.
(1) While holding down one tone select button, push a second tone button.
The LEDs for the 2 selected tone buttons will come on.
<Example>
Lit Lit
© o Oo Oo O 8 Oo O
PIANO 1 PIANO 2 E.PIANO CLAY I JAZZ ORGAN FULL ORGAN HARPSICHORD VIBRAPHONE
While holding down this button
(2) Let's try playing a note on the keyboard.
The two sounds selected (in this case the PIANO 1 and FULL ORGAN) will play
simultaneously.
«Note: «When both the Dual Mode and Chorus or Pan effect are set at
once, the two selected preset sounds will be played with the preset
sound whose select button is on the left side being heard from the
left speaker, and the one whose select button is on the right side
being heard from the right speaker.
«By using Dual Mode and pressing the keys on multiple keyboards,
you can produce up to 10 sounds at one time.
(3) To Cancel Dual Mode;
Press another tone select button, or push either of the lit buttons once again.