I am sort of a guitar head. Becoming great on the keyboard is going to take forever. So I was wondering how good are guitar midi controllers? Can they be used for all articulations or would it be the exact same as hitting a key on the keyboard with velocity sensitivity only. I was cautiously excited about the http://www.fender.com/promos/2010/rockband3/ Does this have any promise? I live far away from any music store that has any midi guitar. All help is appreciated.