| Jazz is not about scales. There are many jazz tunes that use "blues" scales.
Jazz is about rhythm and harmony. Further, there's no quick answer. You can't simply decide to play this or that scale and be a jazz player. If that were the case, I might not suck so bad.
If you are interested in playing and learning more about jazz, and possiblity adding the skills and feel of jazz that you learn to other genres of music, there's no choice but to simply study jazz. Perhaps two days a week you can dedicate to just playing jazz, as opposed to rock and roll.
A teacher would be extremely beneficial. If you absolutely exhaust yourself and can't find a teacher, there are TONS of resources down in the DB side TB. Plus, Mark Levine's "Jazz Theory" book is a good read, as is Rufus Reid's "Evolving Bassist." You would also do well to listen to a lot of straight-ahead, classic swing jazz. Look for bassists such as Paul Chambers, Ray Brown, John Pattitucci, Ron Carter, (and many more). If Cincinnati has a used CD store, go and spend some money, and stock up. | 
