I tried most of the variations you mentioned here, as far as my equipment let me. I started to get better sounds. But... I think GB (maybe all DAW software simulating the amp tones) is not being faithful to carry the characteristics of the natural tones of the bass. (I am leaving out options like Bass Pod's and etc here) I tried my various jazz basses (all equipped with different passive pups: Stock American, Stock Geddy Lee, SD Antiquities, Custom Shop 60's) The problem is all of these instruments sounds so different when played through the same amp. But they sound so similar in GarageBand... I guess that's the downside of modeling sounds on software. Or maybe it's just me. Anyway, enough ideas and tips to keep me recording on GB for now. Thanks for all the replies.