TOYOTA 2011 Avalon - Manual (Page 294)

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3-2. Using the audio system
AVALON_U (OM41428U)
Optimal use of the audio system
Using the audio control function
n Changing modes
Press .
Press that corresponds to the desired mode.
“BASS”, “MID” (type A only), “TREB”, “FADE” or “BAL”
Selector buttons
Adjusting the sound quality
Menu button
Power Volume