Watch the Moving Back online guitar lesson by Brad Carlton from Chord Studies: Jazz Turnarounds Vol. 2
In the last example, you played these voicings in root position on the middle four strings and I showed you how to apply the b5 substitution. What you'll see in this example is that the bass line goes back to the 6th, which gives us a different chord: a D7b9. You'll see the same bass move in the Gm7 to C7 change.