[mofeien]

I have a very low pitched tinnitus around 345 Hz (a little below F4 = 349 Hz), and by deliberately contracting some jaw/ear muscles (I believe stapedius and tensor tympani) the sound gets much more pronounced.

While it helps with starting on the right note when singing a song and deriving single pitches, it by no means makes me instantly know a note's pitch like someone with perfect pitch would experience. I still have to derive pitches manually, and while singing the sound of my voice is loud enough that I don't hear the tinnintus anymore and I often don't notice my singing going slightly out of tune.

I do have the ability to recognize relative pitches in relation to e. g. accompaniment playing in a given key, and this recognition is automatic in a way that the derive-from-tinnitus definitely isn't.

Also sometimes the tinnitus goes out of tune down to almost E4, this sucks.