Re: [tuning] Tuning Lab now open!

Joe,

I wonder about the value of doing these tuning experiments on the tx81z.
The 16 8 4 2 I beleive only has octave partials, hence the name. Start
digging in the editor for that patch and you should be able to confirm that.
Also, resolution of the 'z, 768 steps to the octave, will generate
noticeable beating in intervals that are meant to be just. Even the
resolution of the tg77, another synth I have (1024 steps to the octave) will
generate noticeable beating in harmonic timbres. You may need to check the
accuracy of specific intervals and decide which to use.

Perhaps it is better to use csound, which has very precise control of
frequency and is relatively easy to program for simple experiments like
this.

Darren
SEJIS
Gainesville FL

----- Original Message -----
From: "Joseph Pehrson" <josephpehrson@compuserve.com>

> I re-did Paul Erlich's experiment using the organ patch 16,8,4,2 F on
> the TX81Z as John Starrett suggested. It wasn't too bad on the vibrato
> end... I didn't even need to go into the patch editor...

DBURGESS@ACCELERATION.NET wrote:
> Perhaps it is better to use csound, which has very precise control of
> frequency and is relatively easy to program for simple experiments like
> this.

If one doesn't want to write programs in Csound... CoolEdit2000 can also do pretty accurate tones, and with the merge/paste functionality, should be usable for chords.

Rick

Joseph Pehrson wrote,

>For Example 1, the "dominant seventh" chord Eb-G-Bb-Db, there is
>distinctly less beating in the 12-22t-ET version than in the 12t-ET
>version... However, there is still beating in the 12-22t-ET version...
>slower. Is this good enough, or should I be finding a patch where there
>is NO beating in the 12-22??

Joseph, only JI would give you the impression of NO beating. Remember,
22-tET does a lot better than 12-tET for four of the six intervals in the
dominant seventh chord, but the tritone is just as bad, and the fifth is
worse.

>In Example 2, the "half diminished seventh" mirror Eb-Gb-A-Db, I seem to
>be getting similar beating in both the 12t-ET and 12-22t-ET versions...
>However, the 12-22t-ET version seems "flatter" somehow... it seems like
>it's the "A." (??)

It is just a little bit flatter -- that's just because of the particular
cents deviations of the tuning, isn't it -- it might make for a better
comparison if you transposed it up 10 cents or more.

Darren Burgess wrote,

>I wonder about the value of doing these tuning experiments on the tx81z.
>The 16 8 4 2 I beleive only has octave partials, hence the name. Start
>digging in the editor for that patch and you should be able to confirm
that.

I must agree with Darren. This timbre is OK for comparing the dominant
seventh chords, since harmonic entropy, and roughness between combination
tones, will be audibly greater for the 12-tET version. But it is a
particularly poor timbre for the purpose of investigating the "subharmonic"
or "mirror" version of the dominant seventh chord, since there are no 3rd,
5th, or 7th partials to beat against one another.

>Also, resolution of the 'z, 768 steps to the octave, will generate
>noticeable beating in intervals that are meant to be just.

That's OK -- it's good enough for comparing 12-tET to 22-tET.