billoetjen-
Thanks for the kind words. This forum, both the BG side and the DB side (which I frequent quite a bit more) is really a wonderful resource for all levels, styles and manner of bassist. I'm just glad to be a small part of it.
Loon-
As Mr. Phil and Havic said, using F# to get to G is not problematic, even over D-7 because it stops being a chord tone of D-7 and turns into a leading tone of G7 (F# isn't a chord tone of G7 either, but we still manage to use it all the time. It just becomes one of those quirky little things about walking basslines. And believe it or not, even in the grand scheme of things, approaching G with Ab from D doesn't really sound all that bad either. I've done it plenty of times on this tune and many others. It helps also to remember that 99 times in 100, the bassline won't do enough to alter the harmony that is going on. If the pianist or guitarist is playing the proper chords and voicings, the tenth of a second that you play an Ab over a D-7 chord will hardly be noticeable.
Also! You can walk an entire measure of a chord or two and never play the roots to those chords! Which also opens up a world of possibilities. Example: (I'll start on D just to get started)
|D E F E|F E F Eb|E F G G#|A E A C#| Etc...
Also repeat notes by octaves (I use an apostrophe to show an octave jump up and two apostrophes for down).
|D D' D E|F D G F|E E' E F#|G G# A A"| etc...
And one more trick for tunes like this. Whenever you have a song where two measures of ii-V7 are repeated, you can treat it as one measure of ii and one measure of V7. Here's an example:
|D-7 G7|D-7 G7| ≈ |D-7 |G7 |
It helps that D-7 and G7 share some common tones and are derived from the same scale.
But again, I can't stress how much listening and transcription will help you figure this out. Or even purchase some bassline books. There are some great editions of Ray Brown, Ron Carter, Rufus Reid, etc... that are just their walking basslines over standards and such. Jazz is a music of plagiarism. We learn licks played by the masters and put them into our playing. The same can be said about piano and guitar voicings and comping patterns as well as basslines. I still use the first blues bassline I learned when I was a kid.
And if you're really still struggling with some of this, go out and get yourself a teacher. I can explain all of this till I'm blue in the face, but it'd be really beneficial to have someone that can show you as well as explain it.
Best of luck! And make sure to keep asking questions.
By the way, anyone who reads all this owes me $30 for a music lesson
