2009 Toyota Prius Owners Manual - Page 289

OM47614U_PRIUS_U.book Page 261 Monday, January 11, 2010 11:02 AM 3-3. Using the audio system Setting DSP The following features can be set as desired by touching screen. Type B only on the 3 n Turning Automatic Sound Levelizer (ASL) Type A Touch . Interior features ASL automatically adjusts the volume and tone quality according to the noise level as you drive your vehicle. Type B Touch , or . ASL adjusts the volume and tone quality according to the noise level as you drive your vehicle. 261 PRIUS_U_(OM47614U)