I know a couple of people who really have trouble with this, and it almost seems like dyslexia...instead of left & right, they can't seem tell when to go up or down...they can't 'point' their voice the right way...others just don't hear what the right note should be.

My problem is different.. I can tell YOU when a note is right, but I can not always reproduce it in a song...I suspect MY problem is simply practice and 'feeling' the sequences until muscle memory gets me there...and often, it is just that I have not processed the song in my head enough to be aware of drops or rises...it is simply WORK...I can do it if I practice..(singing in the shower really helps with the acoustics right in your ear!!)