2011 Toyota Corolla Owners Manual - Page 270
2011 Toyota Corolla Manual
Page 270 highlights
3-2. Using the audio system Type B and C Mode displayed BASS MID TREB FADE Sound quality mode Bass* Mid-range* (type C only) Treble* Front/rear volume balance Left/right volume balance Level -5 to 5 -5 to 5 -5 to 5 F7 to R7 Shifts to rear Shifts to front Low High Turn to the left Turn to the right BAL L7 to R7 Shifts to left Shifts to right *: The sound quality level is adjusted individually in each audio mode.