IVOR DARREG, OCTOBER 1987

Studio, 3612 Polk Avenue, San Diego CA 92104 [619] 584-7075

This layout is for use with e.g. two 12-tone tone-generators

24 Notes of 1/4-Comma Meantone OR

24 Notes of the 31-Tone Equal System

LAID OUT ON TWO ORDINARY KEYBOARDS

The limits have been so chosen that the note C doublesharp will provide a subminor seventh (ratio 7/4) for the dominant seventh for the key of A major or minor.

ADDENDUM: -------October 1989 ---PYTHAGOREAN SYSTEM

--The same two keyboards that have been set to 24 notes of meantone as shown and described above, have also been set to 24 notes of the Pythagorean System with either the above tuning, or one change made as shown in parentheses: E-doubleflat for C-doublesharp.

--What works both for Meantone and for Pythagorean, also works for the Helmholtz two-manual-organ scheme.