I just wanted to share a way that I use this concept to create a particular fill lick. Buddy would do long up and down things but I find that it works well for moving up or down a fourth. The idea is that you play in the A+B position. So in this tab, you start at the fifth fret to play over D and then the lick goes up to the 10th fret which would be a G chord.

The lick sets you up very nicely for the Earl Scruggs double hammer on lick so I included that in the tab. The key to doing this is that it is 15 syncopated 8th or 16th notes rather than triplets. It can be used to ascend or descend. I'll include a short bit of audio that uses this lick a three times It's in the key of F played over a 12 bar and it's something that I typically use for a solo on Folsom Prison Blues. It is in F so I is F, IV is Bb, and V is C. First I use the lick to go from F to Bb, do the Earl Scruggs lick over Bb, and then use the chromatic lick twice in a row to go from Bb to F to C.
https://vocaroo.com/19G3H10ti1SN
So it works anytime you move up or down a fourth. In this example, I use it for going from I to IV, IV to I, and I to V. You can use it to go from V to I but I don't really like that as much. But it's also very to go from a secondary dominant to a Dominant such as V/V (essentially the same chord as II) to V.
Hopefully someone can get something out of this.