Hey guys,
Hopefully someone can help me with this!
So I've manage to perfectly intonate my guitar but there is still an issue
Hitting 0 and 12 is fine, no issue, but I noticed that some of the strings are slightly flat on the 24th fret
I noticed this after playing certain chords.

Playing a standard 2 note D5 chord (D, 5th String 5th Fret. A 4th String 7th Fret) everything is fine, but when I move the A to a B (Sliding the 4 string up to fret 9) Everything is out of whack, yet I can play this chord perfectly up an octave still on the same strings

Could this possibly be a truss rod issue or something else?

Last edited by zakarai at Feb 10, 2017,