My voice was certainly high during the actual act! But seriously no long term effect on my voice, as others have said I think this is at after puberty

I have noticed no changes in my voice.

The only change I did notice was when I lost hearing in my left ear but that made my voice sound a little higher then I could hear it before.

But that was due to my hearing actually changing not anything to do with being an eunuch.

My voice deepened dramatically after years of testosterone replacement, long before my castration. I'm told on almost a daily basis that I have a "Radio Voice", or asked if I'd been in broadcasting.I never had a high or squeaky voice, but now it's a deep, rich baritone, thanks to exogenous testosterone since 1993,

I was going to reply, but I see my reply was already posted by several others.

I'm glad that my voice won't change, because I depend on it: I do all the voices in a puppet series. Imagine no longer being able to do that...