Hey @prenaud, welcome to the forums!
Maybe this will help. While some of the sounds might seem random, they are not supposed to be.
Swoosh = prepare for a change in effort
Vroom vroom = get ready to increase power/speed/cadence
Braking = get ready to decrease power/speed/cadence
Ding Ding = surge/settle
Ding = get ready to stand/ stop standing
Gun Shot = give it the beans, i.e. sprint/go hard/go very hard
If the sounds don’t quite match your efforts there could be a problem with the video being out of sync. If that is the case, best to let The Company know.
If you don’t like the sound effects, you can always either adjust the volume, or turn them off all together. There are some workouts where there are no sound effects at all because the frequency of efforts changing is really too high. Eg. The Pro Rides.