Stay with me, this is going to get very interesting
John C.
John....good for you trying to re-introduce "music lingo" back to the group.
Thought I'd add a supplement...the Ab7 before a G7 chord (chromatic progression).
G7 to C in 4/4 time...Ab7 for 2 beats - G7 for 2 beats - to C the root
Example: Ab7/9 chord: from bottom note Gb-Bb-C-Eb
G79/13 chord: from bottom note F-A-B-E
to C6/9 (root) from bottom note C-G-A-D
Keep your posts going!!!