text to speech in Captivate not working.

So I am trying text to speech for the first time and I have tried using vtml code to make the speech sound a tad lees crap.

However text to speech is just reading out anything I try and do so it actually reads out "comma comma" when I enter ',,', and if I put in a <vtml..... code it reads out "vtml_break level" etc etc.

I have to say that I am more than a little concerned how bad this functionality is for a non free software package.

Maybe Im doing something wrong so any help would be greatly appreciated.