Speed Compensated Volume
WARNING: This page is about a different car, the 2013 Ford F-150. However, it is still accessible from the selected car via links, so may be relevant.
The audio DSP module adjusts the audio system volume based on the VSS signal to compensate for speed and wind noise.
When a MyKey® is in use and the MyKey® radio volume limiter is enabled, the speed compensated volume is disabled.