XP-11 Environment sounds

[WhiskyGolf 1]

Greetings!

I'm using XP-11.41.

 

Outside the acft there is no other sound audible besides the own aircraft.

Fueltrucks, followmes are all not audible.

A 747 taxiing and starting - not audible (great for the airport  neighborhood :-))

I

wonder if 'm missing some installation feature. Sound bars are all full open.

Or do I have to get an add on for environmental sounds?

Thanks for hints,

Wolf