Gh4 rockband 2 drumset?

May be...

im trying to connect my gh 4 drum set to play rb2 but it keeps connecting as a controller for vocals i was wondering what im doing wrong because all the Peripherals are supposed to be cross compatible.Im using a PS3

as of now sony has not released the patch for the compatibility.

U cant use the GHWT in RockBand..

ONly RockBand Drum will Work IN GHWT.

Which Is great. No need for me to but the bundle for GHWT

yes