My voice has a strange dull undertone or resonance to it most of the time. I always thought it was an artifact of hearing my own voice on a tape recorder (because my voice sounded "stupid" to me but people told me nobody likes their voice on a tape recorder), until I heard a tape recording of a woman with the same resonance in her voice. (She, too, thought it was an artifact of hearing her own voice on a tape recorder.) Sometimes it's more apparent than others but it does appear to be a feature of my voice.
It explained a few odd incidents throughout my life when people have imitated my voice when repeating something I said. I got very angry at my father once, believing (as I always did when people did this) that he was adding a tone of what most people consider a "stupid" voice to my voice. He was genuinely surprised and said "It's just what you sound like." I also had another kid come up to me when I was a kid and tell me I sounded like my mouth was full of rocks.
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"In my world it's a place of patterns and feel. In my world it's a haven for what is real. It's my world, nobody can steal it, but people like me, we live in the shadows." -Donna Williams