Why have just one?
Agre suggests that in finding yourself you will find your voice. This a great sentiment but I think it leaves out the idea that we as people often have many faces and encounter many different situations that require us to have several different voices. The manner in which I speak at school is completely different from the way the I converse and interact socially. To that end I would suggest in addition to employing the tools he lays out it is important to recognize the rhetorical situation. By rhetorical situation I mean the objects, people, relations, events, and problems that you are encountering. Often enough these components will at least give the speaker a place to start. It furthermore eliminates the fear of obscurity and relevance because you have fuller understanding of what is going on.