To add to the C4 argument I looked up "what is the lowest frequency humans can hear" and it is 20 HZ. That matches up with This Musical Pitch table. So it shows C0 as being the lowest C humans might be able to here and it shows Middle C as 261.626 Hz (midi 60) and as C4.

It seems that we have some logic now suggesting C4 is correct. It comes back to my Joke "Google is King" :-) Hopefully I get some feedback soon on the free phone apps.

I have emailed PG-Music Support about this as well asking for it to be an option with the default of C4 (betting in advance that it is the most popular as a result of the music pitch table).

My friend says the very popular INS phone tuner comes in at C4. Another one in Aimee's video is C4.

Last edited by bowlesj; 12/17/20 06:58 AM.
John Bowles
My playing in my 20s:
https://www.reverbnation.com/johnbowles