[Cushman]

Yes, the sound is fake. There is sound on Mars, though very quiet from our perspective, but the rover (and especially the lander) doesn't have a microphone.

I did find this totally cool video that uses the status tones the lander sent back to earth, though: http://www.space.com/17110-screaming-down-to-mars-how-curios...

[laserDinosaur]

Ha, I guess that makes sense.