šŸ”” Most Elegant Way to Make Keyboard Maestro Chime on the Hour?

Runs and goes, like ls and most other Unix utilities.

Another way would be to use AppleScript to turn the volume down, play the sound via KM, use AppleScript to turn the volume up again -- but that could be annoying if you've something/someone else playing or talking at the time!

This is not elegant. However it might work.

You could possibly duplicate the audio file each hour (to a temp file), and then use something like ffmpeg to reduce / increase the volume of the track based on the current system volume. In theory you could then always have a ding at the same (or similar) real world volume.

Iā€™m not even going to begin to think about the possible issues here. On the other hand, a hack that works might be exactly what you need.