Thanks for your answers! That's definitely not what I understand by "direct playback of MP3s", but well... I finally got it working now. Haven't tested the sound quality yet, but if I have to use Sonic Stage anyway I might as well convert the files to Attrac3+ directly. The reason I would like to get my files on the MD without any special software is that I'm mainly running linux. And I couldn't get the player to be recognized by my old Win98... until I installed the Personal Audio Driver, that is. This forum is cool, and now I'm happy.