That's exactly what I guessed. What I meant by "conventional" are MPEG, AVI etc. But it's not very clever to convert CD+G to AVI (video). You basically unnecessarily blow up your data. For information about formats see also:
http://launch.groups.yahoo.com/group/softkaraoke/message/2289What jim75 has done... He wrote a program to extract a single song from the DVD (database). JBK uses MIDI. That's the only way to fit 10's of 1000 songs onto a DVD.
MIDI's relies on the sound generator of the player, i.e. same MIDI file can sound differently on different players. So, if you follow jim75's steps and play the (extracted) song on a PC there's a chance that it sounds better (I'm using a YAMAHA MIDI hardware for my PC output). I know Arirang has a quite good sound. Californa Electronics' sound is terrible (at least in the old model).
Mavlon wrote
I spoke to someone that deals with the JBK M-4000 karaoke player and he told me that the DVD cannot be copied and played from the USB.
You can however convert CD-G discs into MPEG or AVI files and play them from the USB.
Another cool feature is that you can record your sessions onto the USB drive and play them back.