I did not err in an earlier post; the post simply misspoke itself. Derived Octave-of-Following (DOOF) state was announced as coming next. The post should have intended to say: “Octave-of-Preceding (OOP) state — coming next.”
Octave-of-Preceding (OOP) state is the state in which a fretted note is the octave of the preceding open string.
This is true:
E-string-6 at Fret-5 is an A-note with OOP state re A-string-5
A-string-5 at Fret-5 is a D-note with OOP state re D-string-4
D-string-4 at Fret-5 is a G-note with OOP state re G-string-3
*G-string-3 at Fret-4 is a B-note with OOP state re B-string-2
B-string-2 at Fret-5 is an E-note with OOP state re E-string-1
*OOP state occurs at Fret-5 often enough to be useful for raising note consciousness. The exception is on G-string-3. The interval between G-string-3 and B-string-2 is the only interval that isn’t a Perfect-Fourth; it’s a Major-Third. Therefore, OOP state is a half-step lower at Fret-4.
And there you have it. It’s time for a summary of what we’ve learned so far — coming next.
(c) 2019 JMN