OK. I know this can be done, because I've read posts of other people who are playing a "Backup" of Rock Band 2 with the ROck Band Instruments. I can not for the life of me get the guitar to sync. I took the guitar and dongle to a local game store and they were able to get it to sync with a used retail disc So I came home and tried it again and still no luck. This time i took my system to the same store (removed HBC so they would suspect anything) and again they were able to get the darn thing to sync with another used retail disc (it may have been the same one, but either way it was retail). Came home again and installed HBC again and tried a third time from my CFG USB loader and from NeoGamma (as a DVD boot). Still will not sync. I'm waiting until I get into the game before I try to sync the guitar and dongle, but when I hit the button on the dongle it goes out and will not come back on until I re-boot the system. Any idea, help and suggestions are graciously accepted.