While you can use Jam Pack 4 Real Instrument Apple Loops in GarageBand 1.x, none of the demo songs that come with the package will play. GarageBand 2.x is required for full functionality of the Jam Pack 4.
If you try to play the demo songs in GarageBand 1.x, one or more of the following alert dialogs may appear:
- Performance Warning
- Warning! This song was created by a newer GarageBand version.
- Core Audio: Plug-in "EXS24" not available.
- An error occurred. Result Code = 5000.