My Imac isn't displaying all the real instrument effects
I have Garageband 11 on both my macbook, and my imac. On the macbook, there is a full list of real instrument effects, including ones for guitar, one of which is 'ultra clean'. On my imac, I have a similar list of real instrument effects - vocals, drums, bass, etc, but nothing for guitar. It seems very strange that its on one mac but not the other. Anyone know how to recover these missing effects?
iMac, OS X Mountain Lion (10.8.4)