Like the computer or piano keyboards, the QB offers a full 10 finger capability

Any 5×5 segment of the qb keypad presents a two octave chromatic scale.  The key, in the lower left-hand corner, gives the letter name of the scale; the key, in the upper right-hand corner, is the same letter name, two octaves higher.  This gives a five finger exercise to either hand.  Notice how logical this is-no finger crossing.

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