O.K., let's say you've got a Mbox or similar and you add a high quality tube mic pre that you want to incorporate. Can you somehow bypass the internal pres on the box or do you just run through the new pre and then the box? If so, is it still going to be worth it for sound quality? What's the next upgrade step up after that? Like, if you ditched the Mbox would you get a high quality ad/da converter? So would the best chain for home recording be great mic> great mic pre> great converter> out USB to hard disc?