Is there anyone who knows how to modify unit sounds?

I can't get my units to answer when I click on them. I've edited the voice.txt files; created new WAV files; removed the DAT files, forcing the game to search for the WAVs...

My units respond to orders. They shout out "March!" or whatever. But I can't get them to identify themselves on the first click.

I sent this same request out at least twice on five different forums and I've gotten no answers. Does no one know what to do, or am I just being ignored?

I haven't downloaded any yet, but from the response I've gotten so far I'm guessing all the mods, like RTR, are just silent movies huh?