[jkxyz]

Very nice. Is the function that determines whether a chord inversion is likely to be correct based on any sort of well-known algorithm? I don't have the musical fluency to comprehend what the intervals all correspond to. Seems like a neat solution, though.

[jsrmath]

Totally original. I came up with it by looking at lots of examples and seeing patterns emerge. It's not perfect, but it turns out that checking a select few indicators is sufficient in the vast majority of cases.