Cutting a Vocal in KTV file use Cool Edit Pro

 For the KTV video, to delete the vocal voice is : 

1. Insert your video file. In the menu bar you can find Insert, click it then choose Audio from Video file.

2. Double click your file in the left panel then press the button where is highlighted below. or you can press CTRL+L for the short cut.

3. Right click on the green graphics, then choose Select entire wave.

4. Then right click again , choose copy to new. now in the left panel you will get two similar file but one is mono and one is stereo. for the recording take a look and above :D

I forgot is there Mono L, or Mono R which is have a vocal voice, so if it doesn't work try te right channel :P

Hope this will be use for you :D