Kawai SR2 Owner's Manual page 15

3.3 Hand Percussion
И Touch bars
The touch bars located just below the LOWER
keyboard provide instant access to a snare drum
roll and cymbal crash, usually the two most
popular percussion effects. The roll continues as
long as the touch bar is pressed; the cymbal crash
sounds only for the initial stroke.
Note:
This type of hand percussion cannot be used at the
same time as the ONE-FINGER chord function. (See
р. 11.)