title: Specify number of filter banks in Librosa MFCC
body: <p>How can you specify the number of filter banks in Librosa MFCC feature?:</p>
  <pre><code>librosa.feature.mfcc(y=None, sr=22050, S=None, n_mfcc=20, dct_type=2, norm='ortho', lifter=0, **kwargs)
  </code></pre>
  <p>From the documentation, <code>n_mfcc</code> is the number of MFCCs.  Is that the same as the number of filter banks?</p>