First: all credits belong to Snake2200 the author of the big and excellent XAM1.06b-modifikation for ArmA1.

you can download the hole addon for ArmA1 here:
http://www.armaholic.com/page.php?id=1756

-this mod is not from me, it is only a part of the Xam1.06b-mod from Snake2200

-I have only edited the soundscapes.sqs and the cfgsounds.hpp a little bit (logic,sound balancing)that it works with ArmA2.
Thanks to kju for pushing me into the right direction and also to (Snake2200 wherever he is)!

-This addon gives you:
-excellent nature ambient-sounds
-churchbells with different distances
-different windsounds
-mornigbirds(excellent for europe),wulfs,owls,sparrows,larks,robins..etc.
-birds fleeing on shots

-i have tested it with addons  "sound of war" and also "vopsound" with alpinestars-launcher priority high for xam_environment.
-multiplayer not tested
-no bi-signs included and i am not able to create some

-note: CBA is needed for this.
http://www.armaholic.com/page.php?id=6231

Installation:
1.copy "@xam_environment" to your ArmA2 root directoy
2.edit your shortcut for ArmA2 or use Alpinestars ArmA2-launcher to start.
