With version 1.02 the sound mixing is better overall, but still needs to be improved. The air condition is way to loud in the cockpit. It is bound to the 'systems' slider. You can turn it down, but then you hardly hear any other systems sound (like TCAS announcements, GPWS, etc.).
I do hear the seatbelt signs etc. though. But only with cockpit door open. (which is how it should be, I think).