Okay so as many people have posted you can do certain exercises to help try to naturally lower your voice. Well being as the one thing that usually keeps me from passing is my voice (I'm not on T yet) I'd figure I'd give them a try (I want a deeper voice anyway). Well I called my friend at work the other day (my number wouldn't show up so he didn't know it was me) and I was talking to him for a couple of minutes and I said something about looking for a song for mine and my sister's birthday and he was like "Oh MY GOSH I didn't even recognize your voice!". Now bear in mind, I talk to him at LEAST once a week so for him to notice was HUGE (and he didn't know about the exercises). I was so excited when he said that I almost forgot why I initially called him, lol. He was so happy for me and I was so excited about his compliment, that he didn't even know was a compliment, and I just had to share.