Aggregate Audio Device- half-way works

Greetings. I'm trying to record multiple audio channels through multiple devices using 'aggregate audio device' feature in the Audio Midi setup.
the devices are a MOTU (mark of the unicorn) 896/MOTU896HD daisychained via firewire and going into a powerbook via firewire. Recording software is likely to be Raven (cornell lab of ornithology nature sound recording software).
I can create an aggregated device that says 38 input/40 output channels (the MOTU's can send and receive different formats) in the Aggregate Audio device editor, and these channels show up on the
We want to record in 16 channels- however, in the Audio Midi Setup menu, under Audio input, the aggregated device still only has a max of 8 channels (one MOTU's worth) in the pull-down format menu. Raven sets up recording by looking at the Audio MIDI setup, so only opens 8 channels for recording. What am I missing? Is there some way to get the audio input format to have an option for 16 channels?
Thanks for any help you can provide. Happy Holidays
Alan

An update- Raven now sees two separate streams from the aggregated device, although one is only 2 channels (instead of 8), which makes me think both streams are from the same unit but one a 2 channel master or something like that... (i'll test this with the mics soon).
Any advice on using Audio Midi Setup, as well as how to configure audio devices in the firewire console would be greatly appreciated... I am expecting to be able to chose from the pull-down format menu 16 channels (8+8)- but so far haven't been able to do this.
Thanks, and happy holidays
Powerbook g4 Mac OS X (10.4.3)

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