So what is the mechanics behind barre chords or using a Capo??? I hearfd it moves up and down the neck, but what does this translate on the chrom. scale??
When you move a barre chord shape up one fret, the root moves up one half step (otherwise known as chromatically). Reversely, when you move the shape or capo down one fret, the root moves one half step down. If you capo the 2nd fret, for example, and play a G Major chord, you're actually playing an A Major. To account for this, if the capo is on the 2nd fret, you count up a M2 from the root of the chord that you are playing and that will give you the actual root. 3rd fret capo is m3, 4th fret is M3, 5th fret is a P4, etc.