Ok. I'm trying to get the platinum trophy and the only trophies I don't have are the local match (so I need to actually find someone else who has the game...basically impossible), and to complete a single player game using a microphone or headset....what the hell does that even mean??  The name of the trophy is Shout Out.  Does anyone have any clue on how that's even possible or what I need to do?

Are there any playable vocals in the game? That's probably what it means.

nope just have to have a USB microphone plugged in and play any mix. dont have to sing or anything, just have it plugged in when you play.  I just plugged a rock band mic in and got an easy 5 points!