Unable to combine two distinct USB Audio devices into one Aggregate Device

I'm trying to use Audio MIDI Setup to combing two separate USB audio speaker systems into "one" so that iTunes will play through both simultaneously.
I can create the "Aggregate Device" and add the two USB devices but I can't get the two checkboxes to remain selected after I "Apply" changes when setting them up in "stereo". If I set them to Multichannel quadraphonic then I can select both devices but only one of them will play sound...I assume because iTunes doesn't output in Quadraphonic.
I've searched these forums and the Interwebs and hear of people having success (and difficulties). Difficulties mostly because of the misunderstanding of what a "device" is. These are both EXTERNAL USB devices. One is SoundSticks and the other is a USB audio converter that passes analog into an amp.
Why is this so difficult? Oh, I know...because  wants to sell you $80 Airport Express to stream music wirelessly to devices that are literally ON THE SAME DESK!
Anyone have success (or confirm more failures) with what should be a trivial exercise...

The idea with the Aggregate Device is to allow several audio devices to behave as though they are one multi-port device with discrete one to one I/O mapping. It is not intended for one stereo source to feed more than 2 channels of output.
However...
Set up your aggregate devices as 4 audio outputs, install Jack (http://jackaudio.org/) and use that as a virtual router with qjackctl.
You may also get similar results with Soundflower (http://cycling74.com/products/soundflower/)
Steve

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