I am looking to expand my playing flexibility and was looking to apply this to sweep picking. In order to do this I was interested in applying musical theory to this exercise.
For background, as a beginner and someone who never studied music, I recently discovered that "box shapes" and "solos" are based on specific musical scales which where their shapes come from. (Most tutorials just tell you "play this". Same can be said for chords for example. No one generally tells you why a G-chord [or whatever] looks the way it does unless you know a bit of music or you randomly come across it.)
Surely there is musical theory applied to sweep picking. What scale is used if any? Which notes in the scale do you play or can it be anything? Can you use any scale? What about minor and major?