Korg AT-12 Calibration Help Request

[Bryan Bradfield]

I've just acquired a Korg AT-12 tuner, but no user guide.

Elsewhere on the internet, I saw mention of someone using the AT-12 to calibrate to a known out-of-tune note. For example, the tuner would listen to an out-of-tune piano note, and would calibrate to that note. This report was vague and incomplete.

I can't find any reference to this usage in searching through the forum.

Is that true?

Can anyone explain how to do that?

I've also searched the net, including the Korg web site, searching for a user guide for this tuner. Does anyone know of a source?

[Jack Stoner]

I have an AT12. You can calibrate it for + or - "440". Set it to "CALIB" and then use the Up and Down keys.

On mine, there is no other way to "calibrate" it. You would have to do a trial and error until you got it. e.g. if the piano was slightly flat, you would have to manually recalibrate it one "click" (one click of the down button) at a time and then compare the flat piano with the tuner and repeat that until the tuner reads "0". Then it would be calibrated to the piano.

[Bryan Bradfield]

Thank you Jack.

What does one click of the calibrate button equal? By that I mean, are the up/down buttons set in cycles per second, or what?

[Jack Stoner]

Looks to be about 2 cents (.5Hz) for each click.

[Bryan Bradfield]

That sure looks precise, and usable for fine-tuning. My previous inexpensive tuner changed by 2 hz steps, as I recall. I never used the calibration function in that tuner. I noted how far off a recording would be in cents on the tuner's meter, and would then off-set my instrument tuning by that amount. With the AT-12, I hope to make notes concerning how many "clicks" a recording is off, so that I can recalibrate for tuning up to and playing along with those recordings.