When the Pure-12th tuning concept, invented by a German theorist Bernard Stopper, came out, it was a breakthrough. It simplified all aspects of tuning. All we need to do it tune 12th's and everything else falls in line. Kent Swafford, former president of the PTG, wrote many articles on it which can be found on the PTG archives. No more need to do aural tuning (by ear), as a machine tuning that can detect the 12ths is simply the new way.

@@PianoSens-ey8jb Hello, I know all about Bernhard Stopper (R.I.P.). I know some people who had personal contact with him. And I know about the PTG by Kent Swafford - I use his tunings, too (available for Verituner). But to compare intervals with ear should always a skill - THE skill - in my opinion. And as I wrote: I tune with verituner, because I can use historical temperaments. Only to tune by machine won’t give the deep understanding, why this particular interval sounds like it sounds. Because of a little more stretching in 19th interval (octave+fifth; you write 12th and I know why 😉) 3:1 (octave by Werckmeister was 2:1) there is the result, that the thirds and 10ths are wider in a very minimum way. The masking of beating only works with chords. But how does it sound in e.g. Inventions of Bach which are only in two voices? Once I heard a sample (it is on YT, played by Sokolov), with a very “harsh” sounding 10th. Stopper is not completely beatless, octaves are wider-yes the Pythagorean “Komma” is not in the fifths but splitted in the octaves. There is a saying in Germany: “Jeder Vorteil wird mit einem Nachteil erkauft.“ Translated 1:1: “For every advantage you buy, you will get another disadvantage.” In other words: “No advantage with another disadvantage.” Think, you know what I mean. The disadvantages are-in my opinion-the wider thirds and 10ths. But that is MY opinion. And I think it is okay to tell that. Kent Swafford has a 26th tuning… Also interesting… And that is, what I meant, what I wanted to hear in your vid --- thirds, sixths, 10ths… The octave you’ve showed is absolutely remarkable! The first trust is the app, because of my acute hearing loss 5 years ago (that was the reason to buy Verituner); especially in the high treble I love to use the app - BUT the final control and trust is my ear. And after the acute hearing loss I learned new. And I love to tune by ear. I have built some wood-tools---for the 19th (octave+fifth) and the double-octave. :)

@@SickNick1998 Nick, if you really want unreal never-hear-before tuning, use the PianoSens device. I was shocking everyone at the convention last week with it. My users are all saying they are getting tunings they didn't think possible before. PianoSens.com