Board Thread:Off-Topic Discussion/@comment-6433273-20150620015912/@comment-53539-20150620113355

This may be true, but we can do a google search to find certain answers;

https://vaden.stanford.edu/special-topics/lgbtq-health/transwomen

Like this.

According to this page, the voice is unaffected by Estrogen treatment, so in this case, the person still has a male representative voice regardless.

https://en.wikipedia.org/wiki/Voice_therapy_(transgender)

And according to wikipedia, this is the same.

http://www.nats.org/_Library/Kennedy_JOS_Files_2013/JOS-069-5-2013-571.pdf

And this for reference too for the sake of knowing what happens to our voice due to hormones.

In other words, you can get answers without being an expert on the matter and make judgement based on the expertise of others. So if Kyonosuke was born male, he cannot change his voice to not be male no matter what. He can train it to take more female-esque traits, but its not going to be 100%. In other words, no matter what happens, if he is a male, then Iroha's voice is a representation of the male vocal just as Len and Ryuto are representation of the female vocals.