*THIS PROBLEM DOES NOT OCCUR WITHOUT RYANVM UPDATES, which I am integrating w/ nLite
Running Dell's Audio Driver Install setup, will fix the problem.
First off I realize that this problem may not be a problem of RyanVM at all. But, since I'm using this product along with several others I'm unable to pinpoint where the problem is occurring at this time.
I am building a Universal Image for Dell's business product line. OptiPlex / Latitude.
I am using nLite, RyanVM updates, DriverPacks finisher, and MySysprep.
I am using my own custom driver pack.
I have worked through every issue, except this SigmTel audio driver problem.
The driver I am using was collected from a Dell D630 with the above mentioned Dell obtained driver loaded, and harvested with Driver Genius Professional. This resulted in a SigmaTel directory and a Microsoft HDA directory. I combined these files into a single audio directory... ./D/06/06_D630

These files apparently are not adding correctly, and I don't know why.
I have also tried the Intel Reference Driver with no success.