Man that is so backwards to me. Notes lower on the register are instictively "low" and high notes are "high" to me. Its also weird to me that the lowest note you can play on the banjo wouldn't be #1, and then you count upwards. Its like you count backwards or something. I don't think I will ever get used to that.
but anyways, I'm in CGDA. I figured I could just find out the notes and then play it from there I suppose. Ab goes in there to right?
OK I'll just figure out where they go but I think the fingering is going to be difficult. I might just have to move the, uh, last 3 strings (the three that are on top, but lowest musically) up the fretboard and play the normal diamon shape up there.
C is 4th string. A is 1st string. You could play Bdim by playing 3rd string, 3rd fret (F) / 2nd string, 4th fret (B) / and 1st string, 5th fret (D) . You could add an (F) by playing 4th string ,5th fret
The diminished chord is made of minor thirds. Notes go up in increments of three frets. Because of this fact each of the four notes of a diminished chord can be considered the root of that chord. The four notes of a B diminished chord are B, D, F, G#. Any combination of those notes forms B Diminished, D Diminished, F Diminished and G# Diminished. That chord is also a nice substitution for a Bb7b9 (with no root).
OK, so how do I pull of the diminished chord with the Bb string on top there? ... I only really know the "diamond" shape for the chord and since the Bb is on the first fret I don't know what to do with the rest of the notes.
1021 (from low to high) does not fit your needs, because it contains open string?