Acccordion terminology:
piano accordion, chromatic button accordion
C griff / B griff / bayan (also C/B system)
bellows
treble / bass sections

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C-griff system notes:
1 semi tone diff.= 1 row skip over up/down, or, diagonally along buttons
1 whole tone diff.= 1 button shift diagonally down right/up left

Left hand notes:
5th chord progression=7 semi tones up/down
 = order of sharps, up from F; order of flats downward
 i.e. (D♭ A♭* E♭ B♭ F C* G D A E* B F♯) * buttons are marked
counter base at marked positions: C  E  A♭, same as marked bases

base, counter base, and one base up forms basic major triad

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fr-1xb = 72 base buttons / 62 buttons on treble side

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Resources: