Aiwa NSX-MTD9 Operating Instructions Manual page 16

The tempo of GAME is not adjustable.
To change the volume level of the rhythm pattern
1 Press RHYTHM repeatedly until "LEVEL X" is displayed.
2 Turn MULTI JOG.
Three levels, 1-3, are available.
To stop the beat function
Press BEAT ON/OFF.
BEAT toggles between On and Off.
When you interrupt or stop the playback of the sound source, the BEAT function is automatically switched off.
Using the AUTO mode
The AUTO mode automatically adjusts the tempo of the current rhythm pattern so it coincides with the tempo of the
music.
Depending on the music the AUTO mode may not work correctly (with songs whose tempo is fuzzy, or is varying,
for example).