Playing Chromatic Accordion: Chords, in Passing

Diminished Chords

The Chromatic Button Accordion (CBA) right hand keyboard is configured as vertical rows of buttons, one for each of the three diminished chords. The left hand keyboard has diminished chords as the outside row of buttons.

Passing Chords

Diminished (dim) chords, along with Diminished Seventh (dim7), Half Diminished Seventh (min7 b5), and Augmented chords (Maj #5) serve as Passing Chords.

Passing Chords move chromatically up or down before the beat to major or minor triad, sixth, seventh and ninth chords.

Passing Chords keep the rhythmic flow pulsing, the harmonic flow shifting, and

the melodic flow gliding by filling in the gaps and the seams between the main notes.

Passing Chord Patterns

https://en.wikipedia.org/wiki/Passing_chord

C Major (C, E, G) > C# dim (C#, E, G) > D minor (D, F, A)

C minor (C, Eb, G) > C dim (C, Eb, Gb) > D minor (D, F, A)

C minor (C, Eb, G) > C Aug (C, E, G#) > D minor (D, F, A)

G7 or G/B dim (B dim with a G in the bass (B, D, F)) > C6 (A, C, E) or C Maj7 (B, C, E) or C Maj 6 9 (A, C, D) or C Maj 7 9 (B, D, E)

C Major (C, E, G) > C Aug (C, E, G#) > D minor7 (C, D, F, A)

C Major (C, E, G) > C# dim7 (C#, E, G, Bb) > D minor (D, F, A)

C Major7 (C, E, G, B) > C half dim7 or C min7 b5 (C, Eb, Gb, Bb) > D minor7 (C, D, F, A)

Practice
http://charlieaustinjazz.blogspot.com/2012/03/polarized-passing-chords-with.html

Play ascending and descending major and minor scales, with each note as a chord or arpeggio. Insert a passing chord between the scale steps on the up beat.

For example:
C Maj, C# dim, D min, D# dim, E min, E Aug, F Maj, F# dim7, G Maj, G# dim7, A min, Bb half dim7, G/B dim, Bb Aug, C/A min.