The reason this came to my mind is because of the high graphics customization in Tribes. Your Tribe's logo could be on your base, your flag, your weapon, even. This I find to be a great aspect of the game. Tribes has wierd, headache giving, techno music if you play with the CD in. I reccomend against this, because the game is so good without it.
Some guns make louder noises than others, and any player can name what any sound is.
You can hear your enemies or team coming from behind you while you're repairing a turret, or other things like that. You can choose your voice to be one of five female or one of five male voices. There are popular ones that should be downloaded like the Smack Pack and the Presto Pack so you can hear what other players say. I made my own pack, called the MS Pack. It has sounds from the Simpsons, Futurama, South Park, and a lot more.