Hi Gary, I'm glad you dig the acoustic backing track for the Clapton study.

It is a "quick change" 12 bar blues and I am using 3 voicings for a moving E7

They are 2/5 1/3, 4/5 2/3 & 5/5 4/3 treat these like a classic moving bass blues pattern!

For A7= 2/4 2/2, 4/4 3/2 & 5/4 5/2

For B7 I don't walk it, I just pivot between the B on the 5th and the F# on the sixth while keeping the uper chord stucture 1/4, 2/3, 0/2 & 2/1

I hope this helps. It is a very nice way to get some bass movement while also maintaining the fullness of open chords!

Good luck & have fun, Tom~

PS 2/4 = 2nd frett 4th string