Hi Tomo,
At 17:05 - 17:06 in the demo you do something over over A7 (8th bar of the blues) that sounds close to the diminished device (M3 5 7 b9) for F#7. Is that what you were thinking? Is this a device or lick that you haven't covered yet? It sounds familiar but I was thinking that maybe it related to the I IV ii V relationship. However, I couldn't come up with an obvious explanation. It sounds good, of course.
Thanks,
Brad
Here is Tomo's comment:
"Thanks so much for subscribing to my Guitar Wisdom. That’s my soloing approach: using a diminished sound to play over a Dominant 7th chord (M3, 5, b7, b9)."