sound units

It's arbitrary but, im not only one who hates nomads unit sound.. It's awful, mainly factories sound are really ears killing.

- found some better less anying sounds.

The issue identifies Nomads unit sounds, especially factory sounds, but names no files, tests, entry points, or specific replacement assets. Start by locating the unit sound definitions and comparing the proposed less-annoying sounds; done means the affected sounds are replaced and the factory audio is confirmed to be less harsh in game.

Written by the indexing model from the issue text.