Mercedes-Benz SLR-Class 2007 - Manual (Page 151)

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Controls in detail
Audio system
Balance
̈ Regardless of operating mode, press
the
AUD key repeatedly until BALANCE
appears on the display.
̈ Press L or R key to shift sound accord-
ingly to the left or right speakers.
or
̈ Press both L and R keys simultaneously
to reset the Balance to its center level.
Returning audio functions to factory
settings
̈ Regardless of operating mode, press
and hold
AUD key longer than
2 seconds. RESET will appear in the
display.
All settings for bass, treble and balance
are returned to the center level and the
volume is set to a predefined level.
Audio system sound selection (EXT)*
̈ Regardless of operating mode, press
the
AUD key.
The sound settings menu appears on
the display.
̈ Press the EXT key.
̈ Press one of the function keys.