🚀 go-pugleaf

If the content is different, then the curves can look identical whilst the sound is nothing like the same. For a start, this is a dynamic thing - the levels are changing all the time anyway. It's not safe at all to use frequency analysis as a basis for judging sound quality, because it's simply a means of judging quantity, and this changes instantaneously, certainly in the AA system. It's not too difficult to get snapshots fractions of a second apart that look completely different with most types of music, and that's really the problem.

What you may get on better with is an analyser where averaging can be used, and you can do something like a 1/3 octave analysis - this tends to correlate rather better with what you can hear, but even this isn't perfect. The Ozone analyser can be adjusted to give quite usable results...