Apple has released ProKit 5.1 (Leopard and Snow Leopard), an update to operating system-level components shared by the company's professional and semi-professional applications (Final Cut Studio, Final Cut Pro, Motion, Soundtrack Pro, DVD Studio Pro, Aperture, Final Cut Express, Soundtrack, Logic Pro and Logic Express). Addressed in ProKit 5.1 are improper scrolling behavior, memory leaks, and the "layout of interface elements in certain application alert windows." (Free update, 32.39 MB)
View Extra Audio Details in Snow Leopard
In Snow Leopard, Option-clicking the Volume icon in the menu bar displays a list of sound input and output devices. Choose one to switch to it; it's much easier than using the Sound preference pane. Also, hold Shift and click the icon to set the system volume, which is separate from the general output volume.