On another note, I've been quickly following Symfonie, which seems to be based on QT4.6 and Phonon. I wanted to have a look at the source but it seems it's not available at this point in time... My main concern being that there is apparently a serious performance issue with the equalizer, which I suppose is making use of Effects, and I was wondering if this was a common problem. I'm planning on playing more than one file at a time, and possibly with more than one effect at a time too.