I refer you to my website, there are some things there that can definately help you!
Walking Bass und Guidevoicings - johannes-oehls Jimdo-Page!
A thing that can really help your way of playing walking bass it to realize that there is no
mystery behind this. In fact you can use the clichι chromatic lines any time and get through a
piece, even if you are sight-reading.
First, you got to be sure about the location of the notes on the fretboard, so you are able to
play the root note of every chord without any hesitation.
Then you have to check out how chords are constructed:
maj7 has a major third, a perfect fifth and a major seventh
"x"7 has a major third, a perfect fifth and a minor seventh
m7 has a minor third, perfect fifth and minor seventh
m7b5 has a minor third, diminished fifth and a minor seventh
dim7 has a minor third, diminished fifth and a diminished seventh (enharmonic equivalent of a
major sixth)
If you got that in mind, it becomes easy to play patterns over the changes such as:
R-3-5-3, R-5-3-5
G----------------------------2---0------0---4--5-------
D--------2-------0--2--3-----------0-------------------
A-0---3-----3-------------------------------------------
E--------------------------------------------------------
Am7 Dm7 G7 Cmaj7
That covers the harmonic development of the chord progression. However, if you only rely on
these patters, your walking bass line lacks something.
This is why you add chromatic notes to theses patterns.
If you are playing over a VIm7, IIm7, V7, Imaj7, it is not too much trouble to use some
chromatic notes:
G------------------------------0--2--3--4---5-----
D-----------------0--2--3--4----------------------
A-0---2---3--4-------------------------------------
E---------------------------------------------------
Am7 Dm7 G7 Cmaj7
You will notice that every bar starts with the root of the chord. Then you play the second note
of the chord, which is a major second in every chord we have here. Add two chromatic notes
that lead to the next root, and you are good!
You can also take the pattern I mentioned earlier, and spice it up with some chromatic
approaches.
G----------------------------2---1---0------0---4--5---------
D---------2---1------0---3--------------0---------------------
A--0---3--------------------------------------------------------
E----------------------------------------------------------------
Root-Third-Fifth-Chromatic approach