Fine Tune Display/Remove Points
Karaoke tracks do three things: display words, change the colour of the words as you sing, and finally remove the words again.
The Display/Remove tab lets you adjust the time at which each line appears on screen, and the point at which it's removed again. This is important for tracks where pages 'overlap' - while you're singing the lines at the bottom of the page, those at the top are removed and replaced with lines from the next page.
Karaoke Builder Studio lets you edit the points at which text is displayed and removed. If you don't like the automatic settings (which are calculated so that most people don't need this screen at all), you can change them here.
You can also embed slideshows within the track itself. So instead of a simple note saying 'Instrumental Break', you could have a picture and a countdown to tell the singer when the break will end. The possibilities for customising are endless.
These are options for more advanced users, and as always you don't have to go into this much detail if you don't want to, but the 'power options' are always there if you feel you need them.