haven't played Guitar Hero in years but for PS3 I know it was the Ls and Rs with one button on the face of the controller. That was the case for guitar hero 3
No, you can use the guitar hero 3 controller, which is wireless, for guitar hero two
no
no, you can use a controller.
That completely depends. Is the guitar hero 3 controller for the same platform as the guitar hero 2 controller ? (I.e. xbox 360 or ps2)
yes
Yes.
no
I don't believe you can use the PS3 Guitar Hero controller on the PC to play anything
yes
yes
Insert another Guitar Hero controller, The Guitar Hero Controller if you are playing with a system controller, or your system controller if you have a Guitar Hero controller. I use a Fender Cream Strat when I'm using Guitar Hero for my PlayStation 2. That is because my piano teacher, Rick loves Fender Strats.
Yes, Guitar Hero 2 controller will work in any other guitar hero game same as guitar hero world tour controller can work on any guitar hero game, But you cant use xbox360 controller on another console guitar hero game.