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Author Topic: Out of tune on higher octaves  (Read 1234 times)

bolovintsev

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Out of tune on higher octaves
« on: November 26, 2013, 04:32:34 pm »
After calibrating my MicroBrute using 2 screws on the back panel (I did it same way as for MiniBrute) I got good results.
At the same time on last 2 octaves pitch is going sharp on all notes (the higher the note is the more it's out of tune).
I read that MiniBrute has the same problem due to it's construction.
Is it normal behaviour for MicroBrute?
My music: chitoon.com

Bruno@arturia

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Re: Out of tune on higher octaves
« Reply #1 on: November 26, 2013, 04:39:09 pm »
by how much cents?
Bruno
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bolovintsev

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Re: Out of tune on higher octaves
« Reply #2 on: November 26, 2013, 07:26:43 pm »
I'm using tuner that shows me base frequency (not cents).
This tuner works great with synths (NordLead is perfectly in tune there).
For C6 it shows 1050.5Hz (should be 1046.5) and for C7 (last possible C on a keyboard) it shows 2108 (show be 2093).
My music: chitoon.com

Bruno@arturia

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Re: Out of tune on higher octaves
« Reply #3 on: November 27, 2013, 02:20:14 pm »
so it's around 5 cents on C6 and 11 on C7. It's not crazy for a VCO.
Are you perfectly in tune in low octaves? you can maybe very slightly turn the slope trimmer. It will make low freq a bit sharper, and High freq a bit flatter.
Anyway, you can get a little bit better than 11cents on C7 but it will never be perfect on the whole range.


By the way, I think the NordLead is a Virtual Analog, not a real analog. If so, it's of course in perfect tune everywhere, but that's a different technology.
Bruno
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bolovintsev

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Re: Out of tune on higher octaves
« Reply #4 on: November 27, 2013, 08:18:43 pm »
Got it.
I have pretty good results in low octaves.
I mentioned NordLead just to show that my tuner works well with synths and I can trust it's results.
My music: chitoon.com

an3

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Re: Out of tune on higher octaves
« Reply #5 on: December 03, 2013, 07:35:15 pm »
can u please explain to me (or refer to media sources) how the tuning of the two screws worx. my micro is far out of tune.
regards

snowcrash

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Re: Out of tune on higher octaves
« Reply #6 on: December 04, 2013, 02:59:43 pm »
Don't forget to give it at least 30-45minutes of warmup time before tuning.

Lars

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Re: Out of tune on higher octaves
« Reply #7 on: December 04, 2013, 03:34:57 pm »
got my microbrute yesterday.

how can i figure out that he is "in tune" ? is there a tool to find it out ?

thx

dalasv

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Re: Out of tune on higher octaves
« Reply #8 on: December 04, 2013, 10:23:39 pm »
Yes, a tuner.

an3

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Re: Out of tune on higher octaves
« Reply #9 on: December 05, 2013, 12:10:51 pm »
yes.. yes no novice here.. warm up a tuner n all.. but How to use the 2 screws on the back ?!

Bruno@arturia

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Re: Out of tune on higher octaves
« Reply #10 on: December 06, 2013, 09:40:17 am »
the one next to fine tune is the offset, the other one is the slope.
Bruno
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an3

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Re: Out of tune on higher octaves
« Reply #11 on: December 06, 2013, 02:15:30 pm »
great ! ialtough i coudl gues howit applies a bit mor info would be great. direction relative to what.. maybye a drawing of the relation between the two parameters

tnx

Bruno@arturia

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Re: Out of tune on higher octaves
« Reply #12 on: December 09, 2013, 09:42:39 am »
you can follow the enclosed process. It's been written for minibrute, but it the same for the micro. As I said, the trimmer next to fine tune is the offset, the other one is the slope.
This technote describes one way to calibrate a VCO. you can find another way on the great Yusynth site:
http://yusynth.net/Modular/index_en.html in VCO page.

But take warning, if you're not familiar with this kind of operation, you could very easily have a result worst that what you currently have. It could difficult to have a better result that what the factory does, and you can't go back to factory settings. So use it at your own risks.
Bruno
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BichoVergara

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Re: Out of tune on higher octaves
« Reply #13 on: August 13, 2014, 08:30:34 pm »
Hello everyone ... I think I can explain in simple words how the rear screws works.
I've been trying to tune my microBrute for the past few days, and it was a headache for me to understand how the rear screws works ... after trial and error I have come to the following conclusions:
First of all (as Bruno@arturia said) "the one next to fine tune the offset is, the other one is the slope" ... for me that means nothing, but it serves as a reference.
Sure... warm up for 30-45 minutes and have at hand a tuner.
Take as a reference C3, which is the center C of the central octave (octave 0).
The first screw (Offset) serves to place the knob "fine tune" centered (something like a "gross tune")
The second screw (Slope) serves to zoom in or out C2 from C4.
and there you go!!
The truth is that I am not an expert in analog, and I'm far from being a keyboardist... more like a guy who likes to make noise
If someone wants to correct me, please go ahead!!!.

 

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