A. Unfortunately, as you have found, the installers included with the Jam Packs no longer run under Mac OS X 10.7.x (and later) because they use legacy PowerPC code, so you need to do a little manual work to install them under this version of the OS.
Once you've inserted the DVD...
open it up, if it's not already opened, and control-click on the installer. In the popUp menu that appears, choose Show Package Contents.
In the window that appears open the Contents folder.
Within the Contents folder open the Installers folder.
Here you will find some .pkg files named for the Jam Pack for which it is included. First run the file called XXX_Instruments_Tiger.pkg (where XXX is the name of the Jam Pack). Some errors will be reported, but you can safely ignore them and continue.
Once the instruments are installed you install the loops using the same procedure, launching the XXX_Loops_Tiger.pkg (where once again XXX is the name of the Jam Pack)
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GarageBand from Apple Computer uses audio loops and MIDI loops in Apple Loops format. It can work with Audio Units plug-ins. Apple Macintosh Compatible FireWire and USB interfaces can be used to connect Audio and MIDI instruments to your Mac, and be recorded into GarageBand.
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