It's not console-specific (only the Squier, not the Mustang/102 button guitar). You need to buy the MIDI PRO Adapter that also works with keyboards and drums.
lol I didn't get the beta, either I didn't test early enough or because I'm uns211 on RB2. doesn't matter much since I haven't been able to play due to college prep and whatnot.
I did enable the patches and HBC is gone. I have a NAND backup but I can't use it due to no BootMii.
EDIT: I was able to access BootMii, just need a GC controller to restore.