Very informative Ian. Part of my role at work is doing tannoys which I find at times I run out of steam half way through a sentence. I now have to take a deep intake of breath before I start which I have never had to do in the past. I also now have to write the tannoy down prior to announcement as I was finding half way through I was forgetting what I had to say.
On the up side, I still sound great and am still the best at tannoys at my store :-)