An external pre can be used as the input source, and then if that signal needs a little boost the AW internal pre can give that little boost, if necessary. If you have a really good pre, then you can bypass the internal pre on the 2400, as i described. but generally, sending the external pre into a regular input works quite well. you just have to understand the need for gain staging.
Another way on the 2400 is to put a card with ADAT input into the slot . then you can use the input slots to recieve digital signal to the AW from AD converters of an external pre unit. Many are available with such capacity, to send 8 signals. Presonus makes a couple of versions of such a unit, as did M-Audio, which is the unit I use. This config makes 16 inputs available, and although you can only monitor 12 of them at any one time (at 16 bit), the other 4 can be utilized for ambient mics that need not go into the mix for Front of House, when you are recording a live event.
_________________ Byron
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