Yes, the class can hear me, I always ask them and check that before we start as well as during the class.
But for some reason on the replay of the tape it is not good. ( Live is always better, right?!)
I would do a test run, but there is always a class prior to when I teach and one immediately following so it is making it hard to get the 5 min of pre and post class interaction.
I am going to try two different cameras today and see if that helps. I got out my really, really, really dinousaur old Sony Camcorder, and it has a foam thing on the mic, so maybe that will help filter out some of the extra noise. I think I will also try without the class mic and see if my sound is more clear.
Thanks guys, if you have anything else let me know!
Michelle 
Don't regret doing anything that made you smile!!