2008 Lexus IS 250 Owners Manual - Page 225

3-2. Using the audio system Adjusting the Automatic Sound Levelizer (ASL) Press . The ASL switches between on and off modes each time the switch is pressed. ASL automatically adjusts the volume and tone quality according to the noise level as you drive your vehicle. Changing the listening position (type A only) The sound feel setting can be changed to produce the best sound for each listening position. Press (position selector) to change the setting. The display changes as follows each time the button is pressed. Display "DRIVER" "FRONT" "REAR" "ALL" Listening position Position best suited to the driver's seat Position best suited to the driver's and front passenger seats Position best suited to the rear seats Position best suited to all seats Adjusting sound quality and volume balance n Changing sound quality modes Press Pressing the button changes the sound mode in the following order. "BAS"→"MID"→"TRE"→"FAd"→"BAL"→"SURROUND" (type B only) n Adjusting sound quality Press 226 or to adjust the level.