I have a hard time controlling my volume when emotionally heightened, but I try to use tone as a way to show that it isn't anger that is causing me to yell or raise my voice.

I always want to make it clear to the person I am attempting to communicate with that my emotional response isn't out of anger nor directed at them.

Actually I hate using the word yell... to me it implies anger. If someone tells me to stop yelling when I wouldn't call it yelling ill let them know that "I am not yelling"  they say it again and I have a hard time not snapping "no, THIS IS YELLING."

I know I need to work on controlling the volume of my voice when I am in an emotionally heightened state, but it's my way of expressing the strength of feeling attached to what I am saying.  This, I know, backfires of course because I've learned that no one listens when people raise their voice above a conversational tone.