PS3 Controller Compatibility Routine Patch
Good news, see below-
Available today is a routine update for the PLAYSTATION 3 version of
Rock Band that addresses a number of items related to guitar controller
compatibility. Should Rock Band owners choose to obtain the update, they
will need broadband internet access connected to their PLAYSTATION 3.
The update will be downloaded once the game is started.
Patch not up yet. Will follow up with more info when I have it.