Shazbot!

This just gave me a flash back to back when I used to play Starseige Tribes.

The chat system included quick key commands for a ton of useful voice callouts.

The quick keys and audio sampling made them a lot more fun to use and harder to miss than manually typed messages. As a result, it was much less common to see typed messages popup during regular gameplay.

Looks like they still use the chat system in the latest iteration of the series. http://www.tribesascendwiki.com/Voice_Game_System