Is there a gene for being able to speak in low volume?

It doesn’t seem that all people have it, since I keep encountering people who think they are speaking in low volume when you can hear everything, without them being close enough. It’s not when they are angry etc. I get to hear other people’s problems when I have no choice be sitting close to someone who gave a me a chance to post an OP about cellphone giving and wrong time and date etc.