Is there a specific reason why you would need to do this? IMO, for the average home recordist (well at least for me) it is much more practical to mix with (inside) the software. It's much easier to just click & mix, as opposed to setting everything up to mix with the console.
I remember you from your last post about which mixer would be best, and that you were fairly new to the process. Really, keeping everything IN the software will be less of a learning curve, and will let you gain some critical experience before "moving on" to other things.
But if you really need to for some reason, just click the link ErichS posted and pick one!
I may be way off, but isn't Reason just a sequencer? Like a FL type deal? If so, I would advise you to do your recording elsewhere (different program)... If not, disregard.
Just my .02