FG has so many call outs that you will be hard pressed to hear them all even after playing for an hour. It seems like every game will have different call outs, no two games will sound alike.
Seth Macfarlane recorded the voices for the games, many of which are of course, uniquely made for the game.
To get a HUO FG in trade for your RBION, you will have to add at least $1000, but most likely as high as $1500-2000. It's worth it.