PowerBooks with 4 MB RAM as shipped from the factory will still have System 7.1 loaded on the hard drive, since Apple recommends not installing 7.5 on PowerBooks with only 4 MB of RAM. These machines will also include System 7.5 as a "net install" option which the user may elect to install. Or, U.S. customers may request a set of System 7.5 floppies for a $10 shipping and handling charge, and sales tax, by filling out a coupon available from Apple resellers or on AppleLink. [MHA]
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.