Kenwood KMD-673R - Manual (Page 5)

This function allows you to turn down the volume quickly.
Turning Attenuator On/Off:
Press the ATT button to switch the attenuator on and off.
When the attenuator is on, the ATT indicator blinks.
When the attenuator is off, the volume returns to the original
level.
Turning the volume up, or turning it all the way down deactivates
the attenuator function.
NOTE
Attenuator
Increasing Volume:
Press the u button to turn up the volume.
Decreasing Volume:
Press the d button to turn down the volume.
Volume
Turning on the power:
Press the SRC button.
Turn the power on before carrying out the following procedures.
Turning off the power:
Hold down the PWR OFF button for one second or more.
NOTE
Power
General features
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ATT indicator
LOUD indicator