This will play ambience sound when you are in the wilderness at day.
Birds and crickets etc.
Caution though, the sound files are rather large ~13MB <- was updated, and very erm... crowded with animals.
I can only recommend this with a tropical overhaul like Lush & Goudy Tropical Frippery!

You can add your own stereo wav sound files into the folder: sounds/fx/jungle/day

This should be compatible with absolutely everything.