Excerpt from "Accordion Resource Manual"

    "The accordion contains two independent manuals, a piano keyboard and a buttonboard manual for the left hand.  These two manuals are separated by the bellows.  Sound is produced by the bellows forcing air through two way steel and aluminum reeds...

    Although different concepts of registration exist, Canada has adopted a principle called exact pitch notation, whereby the composer notates the exact pitch to be heard regardless of the register to be employed.  Once the register is chosen based on factors pertaining to tone colour, balance, reed response etc. the written pitch will represent the exact pitch as well as the pitch of the lowest sounding set of reeds.  It is the performer who makes the necessary adjustments in hand position to accommodate the written pitch."


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