I have been playing around with Apple's iTunes software and haven't had any problems. The visualizer tool, the daisy button, in the bottom right-hand corner is pretty cool. You can alter the visualizations by pressing certain keys. While the visualization is running, hit the question mark key and you will get a menu of options. Hitting the 0-9 keys will prompt configuration changes. B will place the Apple logo in the bottom right corner of the screen and then it will slowly fade away. Q and W will cycle forward and backward through various waveforms. A and S will cycle forward and backward through styles of the waveforms. Z and X will allow you to change color schemes. The visualization tool also works without music and can be used as a screen saver. All information courtesy of Macintouch.