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 Forum index » Clavia Nord Modular » Nord Modular G2 Discussion
Master Tune : LA-A 440 Hz to 432 Hz
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Electromagnetic Wave



Joined: Apr 28, 2013
Posts: 61
Location: Kebek
G2 patch files: 10

PostPosted: Sat Aug 31, 2013 10:46 pm    Post subject: Master Tune : LA-A 440 Hz to 432 Hz Reply with quote  Mark this post and the followings unread

Hi!

Is it a way to tune the G2 exactly to LA-A : 432 Hz instead of LA-A : 440 Hz ?

DO-C : 256 Hz
RE-D : 288 Hz
MI-E : 324 Hz
FA-F : 342 Hz
SOl-G : 384 Hz
LA-A : 432 Hz
SI-B : 484 Hz


The Cent value-determination of this interval (440 Hz to 432 Hz) is -31.76665363342928 cents.

reference : http://www.sengpielaudio.com/calculator-centsratio.htm

I can edit the Master Tune in the "system menu" from the G2. But I can just edit cent from an integer value (+1/-1 cent). I can fix the value on -32 cents but this is not exactly on 432 Hz.

What's about the scala tool with the g2 to solve it ? I just read on this. Is it the best solution for me ?

Thanks!

Smile
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varice



Joined: Dec 29, 2004
Posts: 711
Location: Northeastern shore of Toledo Bend
Audio files: 22
G2 patch files: 49

PostPosted: Sun Sep 01, 2013 12:47 pm    Post subject: Re: Master Tune : LA-A 440 Hz to 432 Hz Reply with quote  Mark this post and the followings unread

[EDIT] It appears that the note frequencies in your scale match an example of the Pythagorean scale. Since the G2 uses equal temperament by default, if you want to tune the G2 to this scale (or any other non-equal temperament scale), then you will need to use the ScalaG2 tool for that. Just setting the Master Tuning to A = 432 Hz will not give you a Pythagorean scale.
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varice
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Electromagnetic Wave



Joined: Apr 28, 2013
Posts: 61
Location: Kebek
G2 patch files: 10

PostPosted: Mon Sep 02, 2013 12:35 am    Post subject: Reply with quote  Mark this post and the followings unread

Thank you Varice. You're right, the G2 uses equal temperament. I have to use the ScalaG2 tool for that.
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Electromagnetic Wave



Joined: Apr 28, 2013
Posts: 61
Location: Kebek
G2 patch files: 10

PostPosted: Sun Sep 15, 2013 5:48 am    Post subject: Reply with quote  Mark this post and the followings unread

Good Sunday everyone !


Can I have to use a ".kbm" file both with a .".scl" to get the right tuning ?

I read somewhere that I have to set the master tuning on the G2 to "-38 cents" with the pythagorean scala file. But after making some tests, I realise that I have to use a different value for the master tune for each note... hmmm...this is not normal.

I'm confuse because the interval between each note seem ok. I can ear the "Perfect fifth" and the "Wolf interval" when I play keyboard.


There is a .prf to understand what I'm saying. In the Scala G2 patch above :

Slot1 (fixed note with Hertz / KBT OFF) :

Variation 1-8 / keyboard note / Hertz / Cents

variation1 C-256 (-48 cents)
variation2 D-288 (-25 cents)
variation3 E-324 (-25 cents)
variation4 F-341.33 (-48 cents)
variation5 G-384 (-24 cents)
variation6 A-432 (-24 cents)
variation7 B-486 (-24 cents)
variation8 C-512 (-48 cents)


Slot 2 : pythagorean patch. Just play the same note as slot 1 to listen if the two notes are in phase.


And there are some info from the scala topic :

Quote:
Note Number 0 is 5 octaves below middle C!

Also, the Scala .scl format does not specify how the starting pitch of the tuning is to be mapped to the keyboard - I beleive the implementation details are left up to the synth itself.


Quote:
...that there is another type of Scala file, ".kbm", which specifies the keyboard mapping. This helps explain why the .scl files do not specify a mapping at all. My G2X keyboard doesn't even go below MIDI Note Number 12 (C which is 4 octaves below middle C), unless I am mistaken.


http://electro-music.com/forum/uptopic114285.html




Quote:
I did get clarification from Manuel Op De Coul on the difference between Middle Note and Reference Note in the .kbm format spec. As a recap, the sample template:

! Template for a keyboard mapping
!
! Size of map (greater than or equal to the number of notes in the scale
! to be mapped). The pattern repeats every so many keys:
12
! First MIDI note number to retune:
0
! Last MIDI note number to retune:
127
! Middle note where scale degree 0 is mapped to:
60
! Reference note for which frequency is given:
69
! Frequency to tune the above note to (floating point e.g. 440.0):
440.0
! Scale degree to consider as formal octave (determines difference in pitch
! between adjacent mapping patterns):
12
! Mapping.
! The numbers represent scale degrees mapped to keys. The first degree is for
! the given middle note, the next for subsequent higher keys.
! For an unmapped key, put in an "x". At the end, unmapped keys may be left out.
0
1
2
3
4
5
6
7
8
9
10
11

Explanation:

- First and Last MIDI Note To Retune look self-explanatory

- Middle Note = MIDI Note Number which will be the 0th degree of the scale. In the above sample template, MIDI Note Number 60 is the 0th degree. So Note Number 61 = 1st degree, Note Number 62 = 2nd degree, etc.

- Reference Note = The MIDI Note Number to which the absolute frequency (in Hz, not cents) will be applied. In the above example, that would be MIDI Note Number 69 (typically mapped to A above middle C). All other MIDI Note Numbers are thus offset from Reference Note by the frequency ratios or cents specified in the .scl file.

- Reference Frequency = The absolute frequency of Reference Note above. In the above example, MIDI Note Number 69 is to be tuned to 440Hz.



**********************************

*************************************
Pythagorean Tuning
12
!
256/243
9/8
32/27
81/64
4/3
1024/729
3/2
128/81
27/16
16/9
243/128
2/1


TuningTest11.prf2
 Description:
To test the pythagorean tuning with the scala G2 tool

Download
 Filename:  TuningTest11.prf2
 Filesize:  8.41 KB
 Downloaded:  104 Time(s)

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