The first instruments had ten or twenty buttons, and were diatonic each row of buttons has the notes of one particular key and playing a scale requires alternating between press and draw of the bellows. On 20-button instruments, the two rows of buttons would play in keys a fifth apart (like C/G). Over the years the keyboards were expanded to extend the range, to allow accidental notes, and to allow notes to be played in both directions of the bellows, so that a scale could be played without alternating press and draw. Some expanded instruments have as many as 75 buttons.
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