In case anyone wants these, as requested by 461am and smirkis, here are two MGS ringtones. One is the regular codec bleep ringtone when Snake receives a call, the other is after Snake is killed, the continue screen where it goes "Snake, Snake, SNAAAAAAAAAAAAAAAKE!" or something like that, you'll know when you hear it. To add, add via iTunes or /Library/Ringtones via SSH. These ringtones are already ready to add. Enjoy
