Kawai ES520 Owner's Manual page 45

 C ontrolling MIDI file playback
While the MIDI file is playing:
Press the PLAY/STOP button to pause and resume playback.
Press the RESET button to return to the beginning of the MIDI
file.
 A djusting the MIDI file playback tempo
Press the or VALUE buttons to adjust the playback tempo.
* The playback tempo can be adjusted within the range of 10~300.
3. Exiting USB playback mode
Press the EXIT button to exit the USB Recorder.
The instrument will return to normal playing mode.
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