I just bought Lego Rock Band PS3.
While my Rock Band (1) Instruments (Drumkit and Guitar) work fine,
the Microphone as part of the same set does not seem to work in LRB.
It does not complain about a missing mic, but there is no pitch indicator etc.
The microphone did not work in Rock Band 2 initially (but it told so asking to plug-in the controller).
I thought I fixed this by setting up that Logitech mic in the PS3 peripherial settings as all is fine in Rock Band 2 since then, but fails in LRB.