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[mfcc] default to full range when not using 40 filters

--- a/src/spectral/mfcc.c

+++ b/src/spectral/mfcc.c

@@ -75,7 +75,11 @@

   /* filterbank allocation */

   mfcc->fb = new_aubio_filterbank (n_filters, mfcc->win_s);

-  aubio_filterbank_set_mel_coeffs_slaney (mfcc->fb, samplerate);

+  if (n_filters == 40)

+    aubio_filterbank_set_mel_coeffs_slaney (mfcc->fb, samplerate);

+  else

+    aubio_filterbank_set_mel_coeffs(mfcc->fb, samplerate,

+        0, samplerate/2.);

   /* allocating buffers */

   mfcc->in_dct = new_fvec (n_filters);