The button layout is altered so that the high notes are played on the right and the low notes on the left. This makes it easier to play a melody with an accompaniment. There are several keyboard systems available: * MacCann duet * Crane duet * Triumph duet * Jeffries duet * Hayden duet * Wheatstone systems: * Wheatstone Double * Wheatstone Duett * Wheatstone Chidley The Hayden system is the most recent development, invented by Brian Hayden.
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