Keyboard Layout; From Piano To Plexus - H-Pi Instruments Tonal Plexus TPX 2s User Manual

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2. Keyboard Layout

The Tonal Plexus keyboard geometry was designed in 2002 by Aaron Andrew Hunt. This particular
geometry is unique in the history of the musical keyboard, although it bears resemblance to previous
inventions known as generalized keyboards, early examples of which are found in the work of Paul
Von Janko (1875) and R.H.M. Bosanquet (1877).

From Piano To Plexus

The Tonal Plexus keyboard layout is based on the traditional piano keyboard pattern of 7 white and
5 black keys, with standard fifths-based note names as shown below, piano keys carrying multiple
names as shown.
All standard note names correspond to unique, non-dulpicate keys on the Tonal Plexus. Extended
fifths-based note naming leads to a new set of enharmonics.
• 6 triple-sharps
• 6 triple-flats
These 12 new enharmonic keys are shown at the top and bottom edges of the layout, the blue keys
in the images above and Figure 1 below.
• 7 naturals
• 7 sharps
• 7 flats
• 7 double-sharps
• 7 double-flats
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