Here's a thread where ADMIN riefly explains the difference. .
Sam and GDUNS are right.
MP3's retain their character when imported into KMA format.
Hoster uses WMA compression when importing CDG's from discs or hard drive, not MP3.
Scroll down to post #4.
http://forum.mtu.com/showthread.php?p=37181#post37181
At least that's how I read what ADMIN said.
George