Once I gave a big speech to auditorium (there was some famous deaf people watching me). After my speech was done, they enjoyed it, and one person - he is ASL professor at some college came up to me and asked me to see if there was a food in my mouth during my presentation? I told him no (and feel bit offended) and he said well it looks like I put some food in my mouth and stay in there. Can you speak? I told him, I can speak w/o voice. He said, use it, because when I speak, and sign ... that would make people to understand me clearly. After that, I changed it rapidly, and speak and sign at sametime. It's up to everyone really.
This video is good example.
[yt]ahWp1XogFEM[/yt]