I have GarageBand 1 (from iLife '04), it came preinstalled on my PowerMac G5 dual-1.8GHz. Today I bought Jam Pack 4 and installed it, following the instructions (insert disc 1, run the installer, eject, insert disc 2, run the installer). Every time I try to add a new track and select any of the new instruments on the Software Instrument tab, it gives me this error: Core Audio: Plug-In 'EXS24'& not available! What does that mean and what could be wrong? I tried searching google for that error but it doesn't come up with anything. Any ideas? TIA.