When driving in testing mode (or with noone else on the track) the sound seems to be too much on the left channel. Agreed, when sitting in a kart the engine and the exhaust is not centered ... but this sounds a little bit too much unbalanced. It is even more unbalanced when playing with a headset (try this: only left speaker on ear ... drive a lap ... only rigth speaker on ear .... another lap).
Using onboard sound.
Yep, same probleme here.