Added example of spectrogram plot #1
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You might consider adding an example such as the one I created, that demonstrates how to use the mdct output to make a spectrogram plot. I made one which offers a comparison of the standard pyplot spectrogram with your stft and mdct methods.
If you're not interested in including this, no worries. Might help someone else though. :-)
I grant permission for you or others to use the merged code with no attribution, or license of any kind.