Isomorphic Instruments

The instruments listed here and on the websites linked below follow the principle of isomorphism, the identical or similar appearance of intervals in all transpositions. This means they are key-neutral and scale-neutral. Isomorphism is also found in many alternative notation systems.

General

Intuitive Instruments for Improvisers (Paul Hirsh) – http://improvise.free.fr/  A website about isomorphic instruments, isomorphic panpipes, Janko keyboards, and more…

Keyboards, Accordions, Button Instruments

Generalized keyboard, a predecessor of the Janko keyboard that accommodates microtonal tunings (invented by R. H. M. Bosanquet, extended by Erv Wilson and others) – http://en.wikipedia.org/wiki/Generalized_keyboard , http://improvise.free.fr/bosanquet/bosanquet.html

Janko Keyboard Layout with two whole tone scale rows

Daskin brand Janko Keyboards (Paul Vandervoort) – http://daskin.com/

Lippens keyboard derived from Janko’s design

Chromatone brand Janko-style keyboards (Japanese company) – http://chromatone.jp/

Chromatone Lite for iPad – http://itunes.apple.com/us/app/chromatone-lite-for-ipad/id382628130?mt=8#

Dodeka Keyboard – http://www.dodeka.info/DodekaEnglish/Instruments.html

The Balanced Keyboard (Bart Willemse) – http://balanced-keyboard.com/

Chromatic Button Accordions – http://en.wikipedia.org/wiki/Chromatic_button_accordion

C-thru music’s “Axis” instruments using the isomorphic harmonic table note layout – http://www.c-thru-music.com/ , http://www.theshapeofmusic.com/history.php

Wicki-Hayden Note Layout

Musix for iPad – http://www.shiverware.com/musix.html One of the layouts is the Wicki-Hayden.

AltKeyboards website on isomorphic keyboards, focusing on the Wicki-Hayden note layout (Ken Rushton) – http://www.AltKeyboards.com

The DIY Keyboard Project (Drew Wagner) – http://diykeyboard.org  Focuses on building alternative, isomorphic keyboards. It is an open-source hardware development project with the goal of making all of the CAD files, microcontroller code, etc. necessary for a hobbyist to build a digital keyboard freely available.

6-6 Colored Traditional (7-5) Keyboard (on this wiki)

Woodwinds

Isomorphic Saxophones and Flutes (Jim Schmidt) – http://www.jsengineering.net/

String Instruments

The Harpejji, an alternative, isomorphic string instrument (like a combination of a Janko keyboard and an electric guitar) – http://www.marcodi.com/Wiki Page

Chromatic harp – http://www.chromatiker.de/Harfenbauer.html (Page in German)

Vibraphones

Isomorphic Vibraphone with a Janko-style layout, and three-color pattern (Roy Pertchik) – see Tri-Chromatic Keyboard Pattern