I don't think I am aware of anyone ever developing a true sense of perfect pitch past their childhood. You are developing your sense of relative pitch to the point that you can retain a note in your head. I can do this with tubas - without a reference I can tell what note someone is playing over a couple of octaves with about 80% accuracy. But what I am doing (and what it sounds like you are doing) is recognizing really fine changes in timbre (tone quality). That is why I can't tell pitch on other instruments when I hear them. True perfect pitch would allow me to hear pitch regardless of timbre. Think of it this way - it would be the ability to "hear" any pitch in your head, or recognize it without a reference the way almost everyone can "see" color in their heads or recognize blue or red when they see it. This more relative pitch is still really valuable, and what you will find even more valuable is the ability to play melodic or even harmonic passages back from first hearing. Try playing things you hear on cds back to the stereo, things like this... Another thing this is useful for is to be able to look at sheet music and be able to "hear" it in your head. Get a tuning fork A440 (they are usually less than $10) and listen to the A from the fork and then sing other notes relative to the A. Practice singing an E or a D after hearing the fork so that you are hearing the relationship between the notes in your head as a concrete thing. Good luck! After some time you will find that you will hear so many more things when you listen to music.
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Cogito ergo spud -- I think, therefore I yam
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