Hoster Lite does not allow adding a track from customer discs on the fly like the full version. As described in their description from the Hoster Lite page.
Video Hoster® Features Missing in Video Hoster® Lite
- Cannot prepare and print a Song Book
- Cannot play songs directly from CDG Karaoke discs others bring
- Installs on one computer (Video Hoster installs on 2 for backup)
http://mtu.com/basics/karaoke-hosterlite.htm