The way I would do it... you'll have to bypass the Reason Mixer (if using one) and patch each module directly into the Audio Interface...
Sample:
With 1 ReDrum module, no mixer...
Press tab in Reason to see the back panels, cables, etc...
You would need to wire the output of the Redrum to Inputs 1 & 2 of the Reason Audio Interface... it has to be in pairs for Stereo... you can do the same with each sound from the drum machine if you want to route each one to a separate pro-tools track... just patch it from the "send out" of each one...
Then you need to setup the Rewire insert in pro-tools for each channel, you can route each channel from the Reason Audio Interface to an individual track in your pro-tools session...
Hope this makes sense, it's a little hard to describe it without doing it...
Peace.
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