Boss Dr. Beat DB-88 Owner's Manual page 12

4. Set the beat with the Beat 1 and 2 buttons.
* Normally, if you wish to set the simple beat, use
only the Beat 1 button and turn off the Beat 2
button (it stays dark). To make a complex beat,
combine Beat 1 and Beat 2. For instance, if a 5
beat consists of 3 and 2 beats, set Beat 1 to "3" and
Beat 2 to "2."
5. Select the tone you like with the Voice
button.
"1" is a common click sound.
"2" is a click sound ideal for drum training. If
you strike out an accurate rhythm, the sound
will synchronize, and the click will no longer
be heard.
"3" is a female voice. A number is spoken, so
you can clearly determine the current beat.
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6. Press the Start/Stop button to start the
rhythm. Press it again to stop the rhythm.
7. Adjust the volume with the Total Volume
slider.
By using the Rhythm Level sliders at the same
time, you can create 16 beat or syncopation.