Sorry
http://www.mtu.com/support/karaoke-h...on-details.htm
The above is a link explaining the changes from 4103/4 t0 4105.
The LOOP is activated at all times and ADVANCED has simply changed name to DEFINE AREA TO PLAY to make it simpler. It still performs the same functions with some improvements. When you click on it the screen containing the adjustment controls should open, provided you have finished sweeping the lyrics, and are ready to make corrections, or are opening a swept file you saved.
Follow the instructions in your manual.