Racerboy and asanovic!
Fixed it. I had renamed the sound incorrectly, so it works perfectly with the newest GWX version.
I named it sao_1_gun.wav, and the correct name should be sao_1.wav.
Exactly as described by you Racerboy in the readme.
Thanks for your advice
Im afraid I haven't tried the starshell yet, but my guess is that it works ;-)
By the way..
Do you remember which file controls the sound to trigger. I mean... Where to look to make the wav loop.
I have used mini tweaker and Silent 3ditor, but not sure which file to browse.
Thanks again!
Sorry!
My fault
It is working now.