what is auto volume rb3 -rd3 units

friends what is this auto volume. increasing the volume when the car accelerates. I tried, I cut the bottom gas or something, changed the hard gear, the sound of the music did not increase or does anyone know of this feature?

auto volume that you said but I could not see a change in the level of sound that can be felt at all.

Automatically adjusts the sound in gravel and different road conditions.

thank you fevzi brother :)