Aggregate Audio bug in Tiger?

I tried to create an Aggregate Audio device using Tiger's Audio MIDI Setup under /Utilities
I wish to use the aggregate device to broadcast iTunes music through my desk speakers and my Griffin RocketFM fm transmitter to my living room stereo speakers.
I've set up the Aggregate device with multi-channel, Quadraphonic sound. I can even verify that each channel (left speaker living room, right speaker living room, left speaker desk, and right speaker desk) will receive sound by clicking on the speaker icons in the Audio MIDI Setup application.
But when I select the Default Output device to be this new aggregate, only my desk speakers produce sound.
What is going on here? Why can't my RocketFM send sound to my living room speakers via the aggregate device, but it can if I send sound to just the RocketFM? Has anyone else had this problem in 10.4.3? I just bought Tiger, more or less for this functionality (everything else was gravy to me) and it doesn't work as I'd hoped. Any help?

Ok David
I don't pretend to be an expert here but this is what I've found out from my limited experments.
1. There is no "10 channel limit" I was able to use the 410 and a USB audio device to get 12 channels of output.
2. I don't think the system was designed to do what you want.. send the same signal to more than one output at the time.
3. I think the system was designed to aggregrate interfaces for multi channel use... 3 stereo interfaces for 5.1 surround.
Whatever decide you added FIRST to your aggregrate device is the one that gets a stereo output. So if you added your RocketFM to aggregrate device FIRST, it would get the signal, but not your 2nd interface.
If you had a 4 channel source, then all for speakers would work, but each would get only one of the four channels.
I'm guessing that the only speaker setup you were able to select was either stereo, or quad, since (and I'm guessing here), you only had 4 outputs to use. If you had only 4 outputs you couldn't select say, a 7.1 channel setup since you don't have 8 channels of output.
Notice on the speaker set up that you cannot send any channel number to more than one locaton.
Channel 1 and 2 = the main stereo channels.
iTunes is stereo, not multi channel, so the L/R output of iTunes corrosponds to channel 1 and 2 on the speaker set up.
Now, I agree it seems like you SHOULD be able to set it up like you want.... seems like an easy thing to implement, but from what I can see, either there is a bug as you've suggested, or it was not designed to operate that way in the first place.
One other note, adding the interlan audio interface didn't give me any more outputs for some strange reason..
Using the 410 and the internal outputs only gave me 10 outputs
Using the USB audio device and the internal outputs only gave me 2 outputs
but using the USB and the 410 gave me 12... go figure.
Under no circumstances could I get my Pro-Tools Mbox to show up in the aggregrate editor, tho it does show up in the sound pref pane.

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