Pressing and holding this button enables/disables the beep tone function. When the function is enabled the ( 
) icon will appear on the display. Each time a front panel key is pressed a beep tone will sound.
4TREBLE CONTROL
To adjust the treble level, first select the Treble mode by pressing the S button 3 so the TRE indication appears on the display panel. Within 5 seconds of choosing the Treble mode, press the VOL 
button 2to decrease the treble response or the VOL 
button to increase it as desired. The level will be shown on the display panel from a minimum - 7 to a maximum of + 7 (0 indicates flat response). The display will automatically return to the normal indication 5 seconds after the last adjustment or when another function is activated.
5BASS CONTROL
To adjust the bass level, first select the Bass mode by pressing the S button 3 so the BAS indication appears on the display panel.
Within 5 seconds of choosing the Bass mode, press the VOL 
button 2to decrease the bass response or the VOL 
button to increase it as desired. The level will be shown on the display panel from a minimum - 7 to a maximum of + 7 ( 0 indicates flat response). The display will automatically return to the normal indication 5 seconds after the last adjustment or when another function is activated.
6LEFT/RIGHT BALANCE CONTROL
To adjust the 
button 2to adjust the stereo balance to the left channel speakers or the VOL 
button to adjust it to the right channel speakers. The balance position will be shown on the display panel from L 15 (full left) to R 15 (full right). When the volume level between the left and right speakers is equal, 0 will be shown on the display panel. The display will automatically return to the normal indication 5 seconds after the last adjustment or when another function is activated.
7FRONT/REAR FADER CONTROL
To adjust the 
button 2 to adjust the 
button to adjust it to the rear speakers. The fader position will be shown on the display panel from R 15 (full rear) to F 15 (full front). When the level between the front and rear speakers is equal, 0 will be shown on the display panel. The display will automatically return to the normal indication 5 seconds after the last adjustment or when another function is activated.
8LOUDNESS CONTOUR (LOUD)
When listening to music at low volume levels, this feature will boost the bass and treble ranges to compensate for the