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Guitar intonation tuner app?
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Circlotron:
One way of adjusting the intonation of a guitar is to tune a given open string to the correct pitch, then press the 12th fret, pluck,  and see if the pitch is exactly double. If it is a bit sharp or flat then the wedge or similar at the bridge end of the string is adjusted back or forth a little, then tune the open string to correct pitch again, then 12th fret and check for double pitch again... A lot of fiddling around retuning the open string every time.

What I would like to see is set the open string to nominally correct pitch then use that pitch as a reference to check for double because every time you adjust the bridge you also affect the open string. It would be good if you could pluck open, then pluck 12th, and if it is off then adjust the bridge and pluck open straight away again without having to first reset it. We are only looking for an exact 1:2 pitch ratio - not necessarily exact pitch at this stage. When it is finally adjusted right, if open string is right then 12th fret will also be right.

Is there an app that will do this - listen for a reference pitch, as well as have the normal absolute pitches built in? Maybe it's an idea for a new app?

2N3055:
I just use tuner, set open string right, test octave(12th fret), if lover or higher, fiddle with bridge, and than , on tuner you just check if if needle (or light or whatever display is)  is moving when you go open/octave..
If open string is 5 cent low, and octave is 5 cent low , you octave is perfect..
So you can do 5-6 backs and forths, before you go off the fine scale on the tuner. Then you pluck open string, tune in, and keep repeating until you're done. It is really quick and most of the time is bridge setup...

Don't tune octave by ear. Top notch tuners are 10-20 USD. It's good investment.

That is why you can't find app that will do what you asked. Everybody is doing it with tuner the way I explained.
Circlotron:

--- Quote from: 2N3055 on December 10, 2020, 08:31:39 am ---If open string is 5 cent low, and octave is 5 cent low , you octave is perfect..

--- End quote ---
Got it!  :-+
I've been using GuitarTuna on an Android tablet to measure the pitch. Checked it against my function generator and it's as good as dead on.

https://play.google.com/store/apps/details?id=com.ovelin.guitartuna&hl=en_AU&gl=US
2N3055:

--- Quote from: Circlotron on December 10, 2020, 10:14:16 am ---
--- Quote from: 2N3055 on December 10, 2020, 08:31:39 am ---If open string is 5 cent low, and octave is 5 cent low , you octave is perfect..

--- End quote ---
Got it!  :-+
I've been using GuitarTuna on an Android tablet to measure the pitch. Checked it against my function generator and it's as good as dead on.

https://play.google.com/store/apps/details?id=com.ovelin.guitartuna&hl=en_AU&gl=US

--- End quote ---

Looks nice, i'll look at it..
Although I have handheld Seiko, Snark clip on, tuner in effect pedal and in the amp... I guess never enough tuners... They are like multimeters... They just keep piling up....
Benta:
Quite frankly, if you need an app for this, you're not a musician.

Back in the 80s when I worked as a rock guitarist, I did this by ear. And it wasn't difficult:

New guitar: check (and adjust) the fretboard for straightness and possible twist, set the string height, set the bridge sliders for octave correctness.
Adjust the pickups
Done. By ear.

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