Careful about the Sound Manager. As I found in MacOS 8.6, disabling the sound manager would create a situation where if you pressed the mute button on a Wall Street Powerbook, you wouldn't get sound again on Quicktime Movies until after you rebooted the Mac several times. Also it would make it so that only the first movie openned by Quicktime would get sound. If you have a Tech Info Library article stating you don't need the Sound Manager anymore, please e-mail me its address.
Thank you.
Sincerely,
abrody@smart.net