Most people do not have an undeveloped ear unless they have a mental retardation that affects auditory processing.
I was suffering of undeveloped ear and instead of doing some excercises ended up creating thishttps://pitchimprover.com/Many people training their ear found it useful, but I'd like to hear some more expert opinions/suggestions.
In general you made me think that it is good to train more not with synthetic musical material (as in case of the excercises on my site), but real pieces, probably broadening my repertoire would help, thanks