Chord analysis of audio is a pretty complex thing.
I think the ACW does a pretty good job, never seen one that was perfect.

Often depends on the material, loud mutilayered sound with chorus on it is harder to decipher than simple piano/bass stuff..

I think it also has a lot to do with what is being deciphered as the bass 'root' for the chords


I do not work here, but the benefits are still awesome
Make your sound your own!