It is a feature on the Honda Accord sound system that automatically adjusts the volume of the audio system based on the speed of the vehicle. When the vehicle is stopped, the volume will be at its lowest setting. As the vehicle accelerates, the volume will gradually increase until it reaches its maximum setting at highway speeds.
The purpose of SVC is to help compensate for the increased road noise that occurs at higher speeds. This allows drivers to listen to their music at a comfortable volume without having to constantly adjust the volume knob.
SVC can be turned on or off in the sound system settings. If you find that you do not like the way SVC affects the volume of the audio system, you can simply disable it.
