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Capturing audio with playthrough question (ComplexPlayThrough sample)

Hi list,
these are my first steps in Core Audio and I would appreciate some advice.

What I would like to do is capture audio from the built in "Line in" device (as buffers) and also play the audio back while capturing on the default output device.

Now, I've read TN2091 (http://developer.apple.com/technotes/tn2002/ tn2091.html) and my understanding is that since on the newer Intel Macs there are separate devices for input and output, there's no way of doing a "simple play through", right?

Now, I've downloaded the ComplexPlayThrough sample and I am wondering if I need the Varispeed Unit fo what I'm trying to accomplish. Can't I just setup the input and output device with the same stream description and just pass on the incoming buffers to the output device? Is there any good reason to not do it this way?

Also, I've setup notifications for device steam changes, and I see that other apps can change my device's stream description while I am capturing. Is there a way to avoid that, can I take exclusive ownership of the device(s)?

Thanks
Mark
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