I just don't get it: I use and ECHO Layla3G. It has 8 ins and outs and, of course, its own converters. It works and sounds great, but in the relentless pursuit of the golden signal chain, I've always wanted to upgrade to a better set of converters, but I can't wrap my mind around how it would work. If I were to, say, get an Apogee two channel ad/da, would that mean I can only record two sources at a time? Would the chain go mic-pre-converter-s/pdif to Layla - then - s/pdif out back to Apogee and da to monitors? Now, there are eight channel converter boxes that would have a one-to-one relationship with the Layla, but is that the way it's done? This doesn't make sense to me either, as any large studio is obviously going to have way more than eight channels-at-a-time capacity. Are these converter boxes aimed at the smaller market? What am I missing here? (Probably something right under my nose - you can count on me for that!) Let me put it one other way: when you see, say, Dr. Dre hanging out in the studio hoovering over a board with what looks to be about 1000 channels, how is each of the channels converted to digital? What is the relationship?