Atzarin keyboard layout chord shapes

As Atzarin layouts are fully chromatic in both directions of the bellows, each kind of chord can be found both opening and closing the bellows. However, because each note is repeated at a different button in a different row, the chord shape is usually different in each direction of the bellows. Chords may be formed entirely on one row, on two adjacent rows, on two non-adjacent rows, or on all three rows.

The only chords formed entirely on one row are diminished chords, so a dimished chord has the same shape in both directions of the bellows in all 12 musical keys.

Chords formed on two rows, whether adjacent or not, include any major chord, minor chord, 6th chord, minor 6th chord, minor 7th chord, 7th chord or half dimished chord. Chords formed on two adjacent rows have exactly the same shape in all 12 different musical keys, on the draw of the bellows in 8 musical keys and on the push in 8 musical keys too, with an overlap of 4 musical keys in both directions of the bellows.

Specifically, in the Atzarin bandonion layout, any chord formed on two adjacent rows has the same shape on the draw of the bellows in the keys of A, B, C, D, D#, F, F# and G# and on the push of the bellows in A#, B, C#, D, E, F, G and G#. The four musical keys having the same two row chord shapes in both directions of the bellows are B, D, F and G#. For the other 8 musical keys the chord shape in the opposite direction of the bellows is different as it is formed on two non-adjacent rows.

Chords formed on two non-adjacent rows have the tonic note on the third row and have exactly the same shape in 8 different musical keys, on the draw of the bellows in 4 musical keys and on the push in another 4 musical keys. Specifically, in the Atzarin bandonion layout, any chord formed on two non-adjacent rows has the same shape on the draw of the bellows in the keys of A#, C#, E and G, and on the push of the bellows in A, C, D# and F#.

Chords formed on three rows include any Maj7 chord, m(ma7) chord, +7 chord or Maj7#5 chord. Any chord formed on three rows has a different shape in each direction of the bellows out of a total of three possible shapes depnding on which row the tonic note is on. Each shape is valid for 8 different musical keys, on the draw of the bellows in 4 musical keys and on the push in another 4 keys.