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There are a number of undocumented procedures and parameters underpinning the computation of MFCC vectors by AudioLocalMeasurements including

  1. the size and form of the filter bank,
  2. the liftering and pre-emphasis formulae applied and their parameters,
  3. the form and parameters of the Fourier transformations used,
  4. the nature of the normalization of the audio data, etc.

I'm offering a bounty to reproduce the MFCC vectors by AudioLocalMeasurements using Mathematica primitives (FourierDCT, PeriodogramArray, etc.) so that one can understand and make use of the MFCC output.

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