Did some tests:
- From external views, engines sound seems good to me (IMO) for the A320/A321/A330 except the A330 Beluga that has a very low level engines sound
- From internal views, engines sound seems good to me (IMO) for the A320/A321. The A330 & A330 Beluga have an issue with the others views than the pilot one as reported here: A330 Sound Cuts out when selecting an Instrument View