After following all the advices about how to play m4p files in JR (19.0.163), I still do not get the sound out my USB sound card. iTunes plays the file fine, but QT behaves the same way as JR--it appears to play the tune but with no sound. It seems that I need to set some switch in QT to make it work? But, I do not see any way to modify my QT (7.7.6). I also tried to re-download the file from the iTunes shop, but it is no longer available. What shall I do?