Korg Sound on Sound Owner's Manual page 11

13. RHYTHM button and indicator
Press this button briefly to turn the rhythm machine on (the LED will
light up) or off (the LED will turn off). Press and hold down the button
to access the rhythm machine settings page (see page 23).
14. TEMPO/SPEED button
Press this button briefly to display the tempo. You can also set up tap
tempo. Press and hold down the button to display the tempo setting
page (see page 23).
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