Thanks! Initially I used CD-R, 700 NB, maximum speed 52x, which perform very well in the cd burner that I have. (My cd burner has a maximum speed of 40x though.) This was problematic. Then I tried a -used, but empty- CD-RW with a maximum recording speed of 4x. That went o.k. with a positive result. Great, I was happy. I also tried the CD-R using several speeds, like 8x, 24x. The result is always the same: The disk seems to be occupied. Using Windows Explorer it takes a while before files with the extension CDA are shown. However, it is not possible to play the files with Windows Mediaplayer V10. The screen of Mwedia Player turns blank. I do not understand the logic in SonicStage: why is the used CD-RW o.k., while the new CD-Rs do not seem to match? Any further ideas and suggestions?