The reason for changing frequency from 432 to 440 Hz middle A in 1936 by J Goebbels is debatable. Some say it was to accommodate the piano, so the tuning would stay more consistent across the entire keyboard. Others say that it was a Nazi conspiracy in conjunction with Satan. Either way, there is still plenty of evidence that 432 Hz tuning is much more harmonious with numbers found throughout the nature and the universe itself. It’s generally taught that light travels at a speed of 186,000 miles a second. 432 x 432 = 186624 which is a .001201 difference. Ancient cultures knew this. For example, the archaic Egyptian instruments that have been unearthed are tuned to 432 hz. They knew that tuning to 432 Hz middle A created the most harmonic resonance. 144 Hz is a low D and the third eye according to the 432 Hz scale. Interestingly 144 is the 12th number in the Fibonacci sequence or 13th if you count the 0, and 144/12 = 12. There are 12 notes in a scale, or 13 if you count the same note on the octave higher as part of the cycle. Anyone with a sensitive ear will be able to hear a difference. Watch these videos to get a more detailed explanation about where these frequencies can be found, and why they were important to our ancestors:
The Cosmic 432 & The Musical Conspiracy part 1
The Cosmic 432 & The Musical Conspiracy part 2
Check out this online tone generator where you can type a frequency, and save a sinewave of that frequency.