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Topic Summary

Posted by: l_ron_hagar@yahoo.com
« on: April 25, 2020, 04:16:28 am »

What is "Technnote #6?" I am having exactly this same issue. Microbrute is going wildly in and out of tune. Definitely sounds "sick."
Posted by: JiggyWig
« on: January 16, 2016, 12:31:19 pm »

I need to do this procedure as my tuning is more than 15 cents out at +/= 2 octaves.

How do I find the fine tuning center position? There is no marking on my unit. I can guess, but I'll be out....

EDIT.

No worries. It's not that important. Now have tuned to a tolerance of +/- 3 cents across full range. Sweet.
Kinda fiddly, but not difficult.
Posted by: speedymcs
« on: March 25, 2015, 07:05:15 pm »

thanks for the repost, I've also had the microbrute for a couple of months now (bought it new) and quite some tuning problems
Posted by: Bruno@arturia
« on: March 13, 2015, 02:05:04 pm »

repost of VCO calibration technote if needed.
you'll need to be logged in to see it.
Posted by: jaerrod
« on: December 08, 2014, 01:19:30 am »

Any luck anyone??

I tried to open a support ticket.. But nothing happened when I pressed submit... Curious as to if it did anything at all.

Anyways, same problems here, think wont even get in to tune properly, flutters wildly... So cool though, wish it was more practical. Tried tech note 06 several times, updated firmware, nothing helped.

Anyone have a miracle??
Posted by: Envell
« on: November 20, 2014, 05:02:58 pm »

Thanks for the technote06, I asked it to the support two weeks ago but they didn't answer. It seems I can't tune my microbrute :\ if I touch the offset with the screwdriver or if I push it the tune changes.. Will it help if I remove the screw and start from zero?
Another thing is that it didn't reach the stability also after an hour..
Last problem (yes, I've got lots of problems apart from my bad english): the last key (upper C) doesn't produce sound, I've tried pulling out the strip and reinsert it but it didn't sound..maybe a dirty contact?
Thanks for the patience!
Posted by: LoItaliano78
« on: November 12, 2014, 03:36:36 pm »

Weel I hope this won t be a problem at Arturia.I love this synth but the tutning it s a real pain in the ass.I know when I bought it that analog oscillator are hard to get and stay in tune but this one....it's a lottery to tune and get it in tune.Real fun to play and experiment...but if u need to follow ur band with this little devil....good luck m8s.
Here's the technote-6 to try and tune the arturia mictobrute.Several user ask about this.So I hope no one will blame me posting it.Thanks for Ur help Arturia but....tuning the Microbrute seem just a dream atm.U should post a video with a complete walktroughUsers deserve this.Otherwise I guess U all Know very well at Arturia about the tuning problem.Hence there's no solution maybe i Guess

Keep in mind about the slope and offsett hole on ur microbrute.The OFFSET it's the first hole on the left of the FINETUNE knob.The Slope it's the second hole.


Technical note 06
Version 1.0
Date 22 January 2014
MicroBrute
Oscillator Calibration
Page 1/1
Document revisions:
1.0 2014/01/22 Initial document.
Description
This note details the calibration procedure of the MicroBrute oscillator.
Disclaimer
This procedure shall be followed if and only if all of the following conditions fulfills!
· The note tracking is not accurate, i.e. the note played is shifted more than 5 cents when compared to a
reference note.
If and only if your machine fits into the above description, please apply the following method to fix it.
Make sure to fully read and understand the directives contained in the hereunder pages before processing.
Arturia shall not be responsible for any damage or problem caused by misuse of this procedure.
Equipment needed
· Digital tuner (hardware or software)
· 2mm flat screwdriver
Offset Slope
Technical note 06
Version 1.0
Date 22 January 2014
MicroBrute
Oscillator Calibration
Page 2/2
1. Warming up
Plug the power supply unit and switch the MicroBrute on.
The oscillator core being fully analog, requires a minimal warming time of 10 minutes before reliable frequency
stabilization occurs.
Do not proceed to measures or settings before the frequency is totally stable!
2. Reference note
Set the machine in the following configuration:
Press the Octave buttons until reaching the center position: green LED is lit.
Make sure the Fine Tune knob(on the back panel) is at center position.
Press the lowest key on the left of the keyboard, and hold it down.
The frequency should be a perfect C1 at 130.80 Hz (0 cent).
If it is not the case, turn the Slope trimmer to reach this value.
Release the C1 key.
Technical note 06
Version 1.0
Date 22 January 2014
MicroBrute
Oscillator Calibration
Page 3/3
3. Calibration
STEP #1
Press the upper most key on the right of the keyboard and hold it down.
Turn the Offset trimmer to reach C3 at 523.30 Hz (+/- 5 cents).
Once the correct value has been reached, release the key.
STEP #2
Press the lowest key on the left of the keyboard and hold it down.
Turn the Slope trimmer to reach C1 at 130.80 Hz (+/- 5 cents).
Once the correct value has been reached, release the key.
This is an iterative process: redo the 2 above steps until you don't need to modify the trimmers anymore!
As with the major modules of the MicroBrute, the note tracking is pure analog, therefore:
 Full “0-cent accuracy” can not be achieved: +/- 5 cents tolerance generally is OK.
 Expect some drift at the extremes (up to +/- 20 cents): C-3 will *not* be accurate, neither will be C5.
Posted by: Xarah
« on: November 11, 2014, 06:20:58 pm »

Hi,
I need Technote_6
Posted by: hiltonius
« on: November 06, 2014, 05:00:49 pm »

the main audio oscillator on my microbrute is in need of scaling calibration.  it is not consistently in tune throughout its range.  i wrote to arturia tech support about this within weeks of receiving it (maybe a year ago) and never heard back.

can someone please provide to me the calibration routine for the audio oscillator so i can use this for serious work?  i love the synth, but really tire of re-tuning it.

thank you so much
hiltonius
Posted by: avantronica
« on: October 20, 2014, 02:21:23 pm »

Could you share the tech note with us ?
I presume you are allowing for 10minutes vco warm up time before adjusting ?
Posted by: Macaval Cafu
« on: October 16, 2014, 07:21:59 pm »

The tech support replied my e-mail with instructions for tuning the machine with "TechNote_06". I tried to tune the machine with the screws, but the oscillator keeps changing the pitch - as if some kind of "sample&hold" modulator was modulating it. Sometimes it goes away, sometimes it comes back. I am going to return the machine and see if this happens with a new one after some use.

 ::)

André
Posted by: Macaval Cafu
« on: October 11, 2014, 08:37:18 pm »

I am having the exact same problem as well. I've ordered a second hand Arturia Microbrute from an on-line music shop and the pitch just keeps getting out of tune - even after tuning the instrument with the screws.

Does anyone know if this is going to happen to all Microbrutes? Or is this just a specific malfunction with some units?  ???

I would also like to get my hands on that "TechNote_06". I've e-mailed tech support, but nothing so far.

André
Posted by: busygirl
« on: July 17, 2014, 02:46:06 pm »

I just received a new microbrute, it is acting weird as you can see on my video here:

https://www.youtube.com/watch?v=j9CT2nXJRjc

No matter what i do to tune it, even after some time powered on, the pitch is going up and down randomly, using the basic patch arturia sent me to try…

I was wondering if i lost my mind when i heard it for the first time. My tuner didn't lie to me.

 ::)

The service center told me to film this, and then after seeing this video, to fine tune it !!! Excellent, please give me a third hand so i can fine tune it in real time ?!

Posted by: LoItaliano78
« on: July 15, 2014, 01:20:55 am »

I've made a ticket to the service center and write a pm to Bruno@arturia on this forum.They've send me a file just after some day.Very fast.But to be honest on that note it's clearly stated that:

"As with the major modules of the MicroBrute, the note tracking is pure analog, therefore:
 Full “0-cent accuracy” can not be achieved: +/- 5 cents tolerance generally is OK.
 Expect some drift at the extremes (up to +/- 20 cents): C-3 will *not* be accurate, neither will be C5."

After some tweaking  Thats what I've atm after the tuning.

C1---130.80hz
C3---528..50hz.

I've spent 1 hour on slope and offste and that's the best tuning i can made.No chance to be in tune from C1 to C3.In fact as U can see C1 130.80hz and c3 528.50 it's just +/-5 cent.Seem a good spot for an analog synth.The problem now here in Italy it's the hot summer.....no chance to play with this synth live with other players....but what can i say...I really love this microbrute.Dunno If I can Attach here the technote they've send me.
Posted by: absinth
« on: July 12, 2014, 01:01:38 am »

Hi,

I just wanted to add my new Microbrute to a song I´ve recorded and checked the pitch for the first time...

I´ve connected it to an external Tuner and the pitch is about 1/2 halftone too high. So I popped out the fine-tune knob;
tweaking it from complete left to complete right the tuner does not move a bit...

Any ideas? Or is there a way to get a look at this mysterious TechNote_06???

Thanks in advance for every suggestion!

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