Tuning matters! After my daughter complained about how the toms on her new drums sounded like crap, I bought a Tune-Bot (drum tuner), asked Gemini to help me make her toms sound like Dirty Loops, and got busy.

A few hours later, she pronounced them to be "not bad". Win! I wasn't going to get higher praise out of a teenager anyway.

If I was tuning wind chimes, I would probably use Just intonation, not equal temperament because a wind chime play in different keys.

Exceptional circumstances excepted of course.

https://leehite.org/Chimes.htm is the best source of information I've found on chime design and length. They go into great length about the lower octaves and how you can hear them (or not).

The clanky sounds of cheap bamboo or the high pitched screeching of tiny metal chimes are not pleasant. I have two sets of tuned chimes in my garden that are 1" diameter. They both have 6 chimes that are tuned as a set, but they are also tuned when heard together. One set has longer chimes than the other, so when heard together the chords are much richer.

I know it sounds bougie as hell, but it's really quite a nice effect.

Had to look up "Solfeggio Healing Frequencies".

There are plenty of 9-hour long YouTube videos (example [1]) cycling through the frequencies. Apparently to be played while you sleep.

[1] https://youtu.be/iXL_MupS6NQ

I don't see the unit shown anywhere, is the calculator unit-agnostic?

Nice, although a metric version would be helpful :D