Footsteps, skiing, boosting, air rushing, and other movement-related audios are played dynamically: they are modulated in frequency and volume according to respective locomotive movement.

As an example, you can tweak settings for Treading Audio to change the way random footstep audio clips play:

Terrain Response will play liftoff and landing audio based on the liftoff and landing events it broadcasts. This works well in concert with just about any locomotion.