We may be able to provide additional information on using these functions in terms of continuing <=6.1 support. Please let us know if you are still interested.
Did you have a chance to look at it?
For more information on the theory behind ippsLogGaussMixture, please see
Douglas Reynolds Gaussian Mixture Models MIT Lincoln Laboratory, 244 Wood St., Lexington, MA 02140, USA
There are several places to find this article, here is one:
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SRIVASTAVA, S. Fast gaussian evaluations in large vocabulary continuous speech recognition. M.S. Thesis, Department of Electrical and Computer Engineering, Mississippi State University, Oct. 2002
In general, IPP's GMM implementation should be similar to others in terms of parameters and functionality.