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KEYBOARD DESIGNS/ BONSANQUET, WILSON, HANSON Bosanquet 7 rank Keyboard, Classification of Tonal Systems, Linear Notation, and Development of Extended Linear Mapping - Clavichord Mappings - Gral Keyboard Guide - Gral Spectrum -The Alphabet Series - Variation on the 4/7 Keyboard - Patents 1967 & 1961 - MoogLetter - HopkinsLetter - Diophantine Intervals from Temperament Intervals - Diophantine Intervals from Recurrent Intervals - Lambdoma Layouts on Keyboard - Co-Prime Quadrants - Chain of 7s Keyboard - Hanson's Keyboard and Mallet Designs >- Keyboard Schemata of the Scale Tree
Comments on The Keyboard Section updated 5/2014
From Xenharmonikon 1
From Xenharmonikon 2
From Xenharmonikon 3
From Xenharmonikon 3 part 2
From
Xenharmonikon 4, 5, and 6
Scott Hackleman's page on the 19 tone clavichord added 3/2016
Comments on Pre-Gral Keyboard updated 2/2015
PRE-GRAL KEYBOARDS
HANSON KEYBOARDS
From Xenharmonikon XII
MALLET PERCUSSION LAYOUTS