Chris,
Another handy tip when you start running your shows, that will make it look even more professional, is if you put a karaoke screen as your desk top, (you can build one or download one from the net). any picture relating to Karaoke will do, or even advertise your show with your phone number, then just before the start of your show, reduce the screen that Hoster puts out to TV, to a tiny square so it can hardly be seen, you can do this by putting the mouse pointer over one corner of the Hoster screen untill it changes to a small arrow, then click and drag it to a small square, all the people will see is the desktop picture, but when you press play, the Hoster screen automaticly goes to full screen for the lyrics, and when finished it automaticly goes back to a tiny square and all the people see is your desktop picture again. I'm not sure if even MTU are aware this is possible. Hope this helps.
Let me know how you get on.