Im kind of having trouble with what kind of scale or what walking bassline this is, and finding out what key im in.
I start on...Notes: A,B,C,Db,D,Gb,G, and back to A again. I guess you can say that its like some kind of gospel run (not sure on this though) could be.
O.K., I've played what you have here and I know what this bass line is. Even though it's missing a note, this is part of the classic shout pattern used during shouting music. It is in the key of A, so here is the whole thing:
Here is the regular shout bassline: A, C#, D, D#, E, F#, G, G# (repeat)
Here is a variation to that bass line: A, B, C, C#, D, F#, G, G# (repeat)
It's not really a scale, it's more of a gospel bass line. Churches have been playing this bass line for years. I've never seen too many people playing it in A, but it can be done, takes a whole lot of practice.