How do you unlock the sound-sets in Gunpey for the DS

you have to play on hard mode. whoever you beat needs to be the fifth person to unlock there soundsets. some sounds may sound different in the sound box.
if you beat nick 3 times you get all of his soundsets from haxxor 1, 2, and 3. The same thing for hank. sometimes if you already have there soundsets you still go to there world. if you already have there soundset and they are the 5th person, TRY AGAIN!