immersive sounds.. the one with roars of beasts, caw of crows, children in towns.. coming from all around. The name of the mod eludes me though sure someone knows what I mean.
Duncann's Atmospheric Sound Effects
or ThePumaman's Wilderness Sounds
or Leon 'pancreas' Medado's Morrowind Sound Enhancements
or PirateLord's Expanded Sounds.
One of those at a guess