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I've done this with my 828mkII and an ADAT LX20. I used cuemix to route the analog ins to adat outs. You can probably do a similar thing with your 2408.
The 828mkII remembers the cuemix settings after disconnect - don't know about the 2408. I set it up with a computer, but then I disconnected it and took it on the road with the adat. it worked great.