Activision is just the publisher, NeverSoft is the developer, and VIcarious Visions did the Wii porting, so they're the ones that goofed on the sound - which is most likely just a major glitch, I'm sure the actual tracks are recorded in stereo. Also, RedOctane makes the guitars. There aren't any guitars for the 360, PS3, PS2, or PC available alone either. They want to check out the sales for the game on each system before they start pumping out extra controllers, so they can ship accordingly. You can't buy extra drums, mics or guitars for RockBand either - because they want to test the waters first.