How to adjust the sounds?

[Cjr60611 31]

Just converted to Prepar3D v3 and I have to kick myself for not doing it sooner!  Has/will cost me some $$$ but well worth it.

 

Nonetheless, the only real problem I'm having in Prepar3D is the sound(s).  The noise from other planes on the tarmac AND in the air is so loud that becomes difficult to hear the ATC.  I tried to adjust the "sound" settings in the Settings menu but they control every sound  other than the issue I'm having.  No issues with cockpit/interior sounds and ATC volume is fine.  By process of elimination I thought the environmental slider would reduce external sound affects but it doesn't affect this issue.

 

Added Traffic 360 and starting to think that has something to to with it.  If so, I'm not sure how to adjust volume there - is there a way?

 

Again, it's just the external jet engine sound that is distracting.  Only happens at the gate (as other planes fire their engines) and on the runways as planes take off and land.  Today, while flying into New York City area there was a military helo far enough away that I didn't get a proximity warning but I could hear the chopper engines as we passed as fit i were on it... Strange...

 

Has anyone heard of this problem?  Is there a fix?