When I was in school I was active in Choir and Theater and learned to project my voice well. Topped off by a several years in the Army reinforcing the commanding tone, combined with a lack of awareness on my part leads to my talking in a loud voice unintentionally.
The only technique I have been successful with is reducing the opportunities by intentionally staying out of conversations unless I am directly asked questions. This reduces the occurrence of the problem but does not solve it. Many times I have been asked to bring my volume down, even in meetings. It is not something I am doing consciously though.
I seem to notice it becomes more of a problem when I am trying to assert my position. I am told it makes me seem like I am trying to dominate rather than convince, which is not my conscience intent. As a result my arguments for my position are often less effective than when I do manage to control my volume and tone.
Is there anything I can do to keep from becoming boisterous while talking with others?