Orange Touch Up [OTU] enhances Tiberian Sun Firestorm greatly and increases the gameplay possibilities while remaining the original feel of the game. Basically a rebalancing together with new content and lots of spleen.
This addon by Stealth Killer features a new voice for the GDI EVA. Any future version of OTU will feature these files so I give it right away. To install simply put the file into your SUN directory, may as well read the readme.