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#2998903 07/05/20 04:22 AM
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How do you calibrate your Verituner? What reference tone do you use? On youtube there are a lot of videos with a 440 Hz sine wave. When I use that, Verituner shows me that my Yamaha digital piano is to high on A4. I know that the A4 key on the digital piano is not a sine wave and that a correct tuned A4 unison on a real piano measured with Verituner is not necessarily shown as correct because there are still all the other partials. But in my experience with tuning real pianos, any key (correctly tuned unison) in the temperature octave has nearly always the same pitch (shown on Verituner) as a single string of that key. I mean, there is no big difference if I measure a single string or the whole unsion. At least in the middle octave.

My Yamaha digital piano differs also about 3 cents with my North electro 6 keyboard.

So, what do you use?


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What platform are you using? From what I understand, the Apple devices have been stable and well-calibrated.

I still have my tuning fork that is true at body temperature and none of my Verituner devices have ever deviated from that. I wouldn't trust youtube videos - they are dependent on the sound card of whatever device you are viewing on for the actual pitch. Likewise for the digital keyboards as a pitch source.

You may want to try to use measure mode to actually have the display read the first partial of A4 for testing purposes.

Robert Scott knows a lot more about computer sound cards and digital pitch sources to use for calibration!

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I am using TuneLab on another device in generation mode. And TuneLab, in turn, is calibrated very accurately for 6 hours via the Internet. So it’s very convenient.

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In the early days of tuning software, calibration was a big issue because some vendors of sound cards for desktop computers used quartz crystal frequency sources that were not very accurate. In a few cases, an actual bug in the system (I don't know if it was hardware or operating system software) caused a consistent error of 13 cents when certain sound cards were used at certain sample rates. Application-specific calibration corrected for that problem.

For the vast majority of mobile devices now in use, I don't think that is a problem anymore. I have not heard of any modern device - iPhone or Android - that is even a tenth of a cent off, which makes aftermarket calibration essentially unnecessary.


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My two iPhones are within a tenth of a cent calibrated to A440 here: https://en.wikipedia.org/wiki/A440_(pitch_standard)

BTW, Robert's informative article, “Calibration of Pitch References” in the August 2001 Piano Technicians Journal.


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Originally Posted by DavidWB
My two iPhones are within a tenth of a cent calibrated to A440 here: https://en.wikipedia.org/wiki/A440_(pitch_standard)

Ok, I calibrated with that tone from wikipedia. Indeed, my iPod has a deviation of 0.2 cent. But my Yamaha digital piano is still more than 4 cent high, according to the calibrated Verituner. And the North keyboard nearly 1 cent high. Both are supposed to be on 440 Hz.


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Do your keyboards have a pitch adjustment. For example, the Yamaha Clavinova does.

https://www.manualslib.com/manual/196254/Yamaha-Clavinova-Clp-320.html?page=22#manual


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Originally Posted by DavidWB
Do your keyboards have a pitch adjustment. For example, the Yamaha Clavinova does.

https://www.manualslib.com/manual/196254/Yamaha-Clavinova-Clp-320.html?page=22#manual

Yes, but I checked that. Both keyboards are set to 440 Hz.


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Originally Posted by Gregor
Ok, I calibrated with that tone from wikipedia. Indeed, my iPod has a deviation of 0.2 cent. But my Yamaha digital piano is still more than 4 cent high, according to the calibrated Verituner. And the North keyboard nearly 1 cent high. Both are supposed to be on 440 Hz.

Then calibrate your Yamaha to A439 and that should easily take care of the 4 cent deviation.


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