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They're all in 1 folder. The easiest thing to do is hit command F in Finder and search for "Jam Pack". Your results will reveal 1 folder. Delete it.
 
SilentPanda said:
Nope. No problems if you get rid of it. It'll update the listing when you open up Garageband.

unless you delete all the other stuff thats for GB in the library. I did that and after that GB isn't working any more.

Its not a big deal, because on my iBook G3 900MHz it didn't cut the mustard at all. But now I have 5 gigs more space on my harddrive I need for all the music I am ripping from my CDs, just ordered a 20gig iPod. My very first one.
 
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