I have just bought LIPS (with the black&white mics) and LIPS: I (heart) The 80's.
I (heart) The 80's works without a problem, but when playing the original LIPS you can only hear the voice of player 1. Both mics are clearly working as the game registers the players voice on the pitch meter and displays all the corresponding data and awards you just cannot hear the voice.
I have downloaded the automatic updates from LIVE when the game was first inserted and like i previously mentioned, I don't have this problem when playing 80's.
Any ideas or solutions for this problem?