Just as the title says, music capability in the titans would rock. Charging into battle with crazy dub step or thrash metal blaring would add a little something to the game.
Every Pilot worth his salt deserves some kick ass music to go and... well... kick ass!!! One I'd use is (old school as I am) Black Sabbath doing IRON Man, or maybe Edgar Winter playing Frankenstein. Come into a fight with the proverbial chip on your shoulder with an appetite for destruction.