diff -r 29936292cec0 -r 86df26e7a782 README
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     This is a straightforward cepstral pitch- and note-tracker Vamp
     plugin, probably most suited to tracking singing pitch.
 
+    https://code.soundsoftware.ac.uk/projects/cepstral-pitchtracker
 
     Copyright (c) 2012 Chris Cannam