How do I use 2 Core Audio devices at the same time in Logic w/out switching

Hello, I use the Aardvark Direct Mix usb3 as my audio interface for mic and guitar. I just upgraded to Logic Pro 7 today and was hoping someone could tell me how I could use the Built-in Audio Core Audio driver along with the Direct Mix USB Core Audio Driver at the same time without having to switch Core Audio Driver's and than rebooting Logic. It is very frustrating doing that as well as not being able to hear my Logic audio during playback/record mode when I am trying to record via the USB3. WHat can I do? Thanks! If ther are both core audio, why can I not just use both of them at the same time? Why must a switch back and forth? Thanks!
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THanks everyone! awsome article! Thanks for posting it, nh!
The weird thing is, once I go up to the Menu and select Open Aggregate Device Editor in the AUDIO/MIDI setup utility and try to add a new Aggregate Device setup (step # 6 from the link), the only audio device available is the "Built-in Audio". What's weird is when I have the main Audio MIDI Setup utility open, every single drop-down menu/tab has the "Direct Mix USB 3 1.0.9.1" device right beneath the "Built-in Audio" option. To me that says that the core audio device is indeed recognized by my computer (obviously since I can record with it using Logic). Can anyone help me with this one? Any suggestions?
Not that it should matter but, the hardware audio interface that I am using is made by the no-longer-existant company once known as Aardvark. I actually had to purchase a third party Core Audio driver just to have it recognized by OS X.
This is the website where I purchased my audio driver :
http://www.usb-audio.com/
A little more on how this device and it's core audio driver function within Logic . . . (Hopefully this might clarify something I may be screwing up) . . .
I launch Logic with its default Built-in Audio which allows playback of audio from the app. I than go up to Audio Hardware and Drivers and than drop the flip down Driver menu down to the second option, "Direct Mix USB 3 1.0.9.1." Logic than prompts me that I should try to (re)launch Logic Pro to load the appropriate CoreAudio.. I do that. Now I am ready to record guitar through the Direct Mix USB3, I just can't hear anything (unless I use head phones as an output from the Direct Mix).
Anyway, you all probably already knew what I meant so explaining that was pointless. But my question is, if the Driver is obviously recognized by my comp in both the Audio MIDI Setup and in Logic, than why won't the Direct Mix device show up as a possibility for setting up an aggregate device? Any suggestions? Thanks!
Power Mac G5 Dual 2.7Ghz 4.5gigs of RAM Mac OS X (10.4.7)
Power Mac G5 Dual 2.7Ghz 2.5gigs of RAM Mac OS X (10.4)

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