Alternatively, you can just decrease the volume of the file in question,by S3D,I found it while I struggled desperately with seagulls in the fjords around Bergen,in 1944 ....
Later I saw that there are such mod...
There are quite successful, but you just have to look for them and to like something here
http://www.subsim.com/radioroom/down...p?do=cat&id=25 or here
http://www.subsim.com/radioroom/show...171019&page=23
as noted and other captains
There are many online and not just programs that can convert a file or application output file -wave,ogg,stereo or mono