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2 tones


they, most likely, need to be inside the audio passband, maybe under 2 1/2 KHz or so and they need to be kind of split and non-harmonically related. Like... one in the upper hundreds towards 1 KHz and the other could be just over 2 KHz.

Here is a video:

 
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Let's see...

"Key of Middle C" on a piano...

On Sheet Music...
upload_2020-11-23_20-2-59.png

On a Piano...

upload_2020-11-23_19-45-17.png

Note it's not A3 ....

It's approximately ~262 Hz (Cycles per Second)
Cyan color key is C4 (Or middle C)

Go here for help on this
https://en.wikipedia.org/wiki/C_(musical_note)

Note the Amber - color key, A4 - is 440Hz.

Ok, why the above music lesson?

Most Vocals don't use much above 2kHz - 2,000 Hz - unless you want to make your voice sound like scratching fingernails on a chalkboard...

Let the "overtones" take care of themselves, you just have to keep your voice in the correct pass band.

So, A3 to about A5 (if you're a "tenor") Bass? Try A2 to A4 .

So @kaos513 - If you can use both tones - simultaneously - please do so, just remember to run the attenuator to keep their Fundamentals - 1.4kHz, 2.8kHz and above - out - from skewing your tuning results.
 
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