Online bought a karaoke U disk, avi format using the WMP, WMP unable to switch around a track, it opens at only one channel switch audio tracks 1 and two options, the default language can't play function of K song sang, I made with WMP jukebox systems, WMP. Controls. Currrentaudiolanguageindex attribute no reaction, can't eliminate original vocals, customer service said in the video can play accompaniment, code or using other methods to solve it, the new number don't know my score is enough