The aureal driver is currently unusable.
I suspect this is an upstream problem.
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You're quite correct. The Open Source aureal driver is
missing some code. It's mixed (I suspect in violation of
the GPL) with closed-source code in the available
distribution. To keep the FOLK code "legal", the
closed-source code has been omitted. I'm hoping the
necessary code'll get opened up, or a 3rd-party version