mp3 karaoke playerKaraoke on video mp3 player?

I have a Dopi karaoke converter that turns your ipod or video mp3 player into a karaoke machine. The songs are in mp4 format. The first video mp3 player I bought was .mtv formatmp3 karaoke player only, so the software wouldn't convert to the correct format. I bought another video mp3 that says in will play mp4, but it won't convert either. It is .smv format. I also hamp3 karaoke playerve CD+G karaoke CDs that I want to put on the video mp3 player. None of them will convert. How do I get it to work?
You need Power CD+G to iPod Karaoke Converter