Hi:

When I had a Yamaha DX7-II Synthesizer it was possible to choose the tuning=
 (they called it micro tuning) from the=20
following list:
Equal Temperament  http://en.wikipedia.org/wiki/Equal_temperament
Pure (Major)
Pure (Minor)
Mean tone   http://en.wikipedia.org/wiki/Meantone_temperament
Pythagorean   http://en.wikipedia.org/wiki/Pythagorean_tuning
Werckmeister  http://en.wikipedia.org/wiki/Werckmeister_temperament
Kirnberger  http://en.wikipedia.org/wiki/Kirnberger_temperament
Vallotti & Young  http://en.wikipedia.org/wiki/Young_temperament
                             http://en.wikipedia.org/wiki/Vallotti
1/4 Shifted equal http://en.wikipedia.org/wiki/Quarter_tone#Types_of_quarte=
r_tones
1/4 Tone               http://en.wikipedia.org/wiki/Quarter_tone
1/8 Tone

Note:  The DX7 may be the last of the analog synthesizers.  It uses a paten=
ted by Stanford Univ. mixing method to make=20
the sounds.
The rumor was that Stanford offered the patent to Hammond organ Co., but th=
ey didn't take it.  Yamaha sold more DX7=20
synths than the total of all prior models by all makers in a very short tim=
e.

I added a PCB to my DX7 II, but don't remember who made it.  It allowed rem=
ote control from a Radio Shack Color Computer=20
and had a complex rendition of "The Entertainer" built in.  If  you know wh=
o made that PCB let me know.

--=20
Have Fun,

Brooke Clarke
http://www.PRC68.com
http://www.end2partygovernment.com/2012Issues.html
http://www.prc68.com/I/DietNutrition.html

--=20
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