2013 Toyota Matrix Owners Manual - Page 225
2013 Toyota Matrix Manual
Page 225 highlights
3-2. Using the audio system Type B Mode displayed "BASS" "TREBLE" "FADER" Sound quality mode Bass* Treble* Front/rear volume balance Left/right volume balance Level -5 to 5 -5 to 5 F7 to R7 Turn to the left Low Turn to the right High Shifts to front Shifts to rear "BALANCE" L7 to R7 Shifts to left Shifts to right 3 *: The sound quality level is adjusted individually in each audio mode.