3D sound inverted

Hi
in x-plane the sound should be coming from behind and not from the front. Probably a easy fix? Thanks as I cannot figure it out.
The snd looks like:

A
1000
ACF_SOUNDS

##################################

THE INSIDE SOUND SPACE

##################################

BEGIN_SOUND_SPACE
SOUND_INDEX 0
BLEND_DEPTH 0.03
AABB -5.00 -5.00 15.00 5.00 5.00 -5.00
END_SOUND_SPACE

You will need to contact X-Plane.