For electric bass... I already have the "30 etudes" book. Is it worth getting the "New Method"? My reading and technique is already pretty good. I don't really need any help with 124 or 1234 fingering. What I want to do is really cement my knowledge of the full fingerboard in all keys. Also, which edition? There is the red one with the english and japanese, the white one, the blue one, ... Are they different? Does it matter? And what does book 2 cover vs book 1?