Octaves:

Toby
Worth a look if you are interested in the physics and to see how Justin’s lessons develop over time.
I now find I have done 110% of G1; not sure how that is.
Michael

2 Likes

I want to know why Justin’s guitar double dot inlay marker even at the 7th fret just like 12th?

Manufacture’s preference. Some guitars have no dots at all some have squares, stars or parallelograms. There is no rules as to how many dots are on the neck. Just where they are situated on the neck.