RE: Digest Number 513

[Jerry Eskelin, TD513.7]:
>> First, use 7:9 in a major triad, 7:9:10.5 (aka 14:18:21). Hold this for a
>> while. Then drop out the upper voice, and introduce three lower voices,
>> forming a 4:5:6:7:9 with the 7:9 held constant. Voila! The interval that was
>> once so dissonant is now quite consonant.
>
>But my synth won't play ratios--only cents. What now? Okay, I'll try it
>anyway, to see if I can hear the effect you're talking about.

Hi Jerry,

Here's how to convert 4:5:6:7:9:10.5 to cents on your M1...

The first column below is the ratio from 4:5:6..., the second column is
all of those numbers divided by 4. The third column is those fractions
converted to cents. In MS Excel you can get the cents from the second
column fractions with the expression:

=1200*LOG(B1,2)

Where the "B" in "B1" means the second column, the "1" means the first
row in that column. This is even easier to do in Scala -- if you have a
machine that can run it (Windows or Linux) I recommend getting it.

To the right of the "=" sign I've written the equivalent note names and
the difference in cents from equal temperament -- this should be enough
info. to set up your M1:

4 1 0 = C 0
5 1.25 386 = E -14
6 1.5 702 = G +2
7 1.75 969 = A# -31
9 2.25 1404 = D +4
10.5 2.625 1671 = F -29

By the way, I also have a Korg M1, so I might be able to help with other
Korg M1 questions you might have. Feel free to write me directly.

Cheers,
Christopher

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