2013 Hyundai Sonata Owner's Manual - Page 200

Features of your vehicle Speed Dependent Volume Control This feature is used to automatically control the volume level according to the speed of the vehicle. Select [SDVC] Set in 4 levels [Off/ Low/Mid/High] of TUNE knob Blue Link Voice Volume Sets the Blue Link voice recognition volume. ❈ While using Blue Link voice recognition, turning the tune knob will display the volume control popup screen. ❈ May differ depending on the selected audio. Voice Recognition Volume Adjusts voice recognition volume. Select [Voice Recognition Vol.] Set volume of TUNE knob 4 119