Hello.   
As most fans probably noticed, the distant sounds were made (camera F3), you can hear the sound of the afterburner up close, but with other engine sounds there is a problem because nothing is too sweet or very weak.   
Here is an example in the movie: https://www.youtube.com/watch?v=AX5pPLdwuVM   
I don't know if Deka Ironwork Simulations has decided so if it is a mistake. Anyone know more about this? or is there any plans to improve sounds?     
Sorry for the language but translated in google.     
 Regards.