I started hormone blockers at 23 and I'm 7 months HRT but have a voice of a 15 year old for a weird reason. Pre-HRT i sounded 18-19. When I was 18-19, I sounded 15 too. Idk, but in my case, my voice did infact change a little, however I voice trained when I was 22 to deepen my voice while I was in denial. HRT could have just reversed that. Sorry if this is confusing... I do believe HRT makes the voice softer in early transition cases, and in my case, my voice was special to begin with.