My question stems mainly from a lack of understanding of what really my soundcard is doing. Right now I'm running Logic Pro on a powerbook G4 using its built-in soundcard, which may or may not be the reason that I can never satisfactorily reach the level of sound clarity and quality that I want. The problem seems most apparent when I'm mixing a number a voices (e.g., synthesizers) together -- I often hear a slight bit of what might be noise, but what more generally could be described as a lack of clarity. Initially I thought, well, maybe my mixing/ mastering abilities weren't up to par, but the problem seems to remain no matter what I do. All that I have been doing is internally based in logic, no recording or outside applications. Also, there doesn't appear to be anything wrong with my headphone jack, given that I can play tunes in itunes etc. without any problems. I guess my question, then -- would a good soundcard improve my sound quality, given my circumstances as I've described them? If so, any recommendations on a really good soundcard, particularly for use in conjunction w/ logic? Any help would be hugely appreciated! -Kevin