Daisy chaining motu interfaces together

I have a new Motu 896, and 8pre and I'm using Logic 8.
Today I tried daisy chaining the 2 together with firewire so that I could use 16 tracks.
The problem I'm having is, Logic won't recognize the extra tracks. I can choose either interface and the inputs will work separately, 8 inputs from the 896 or 8 inputs from the 8pre, but I haven't been able to get 8+8 together.
Is there some sort of input/output configuration menu I need to assign the tracks to in Logic? I've been skimming the manuals and forums but haven't had any luck so far...
Anybody able to help?

Hi
Have your tried to aggregate your devices?
I have the Duet and Metric Halo 2882 and 8pre
I did an aggregate of the 3 in the Audio Midi Setup and used the Duet as the Output (let's face it, MOTU converters ain't good at all, i keep it just for an extra 8 inputs) and the Aggregate device (Duet + 8pre + Metric Halo) as the input.
Make sure your master clock is set otherwise you'll hear glitches.
Hope that helps

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