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+nnls-chroma is an open source Vamp plugin library for harmony and chord
+extraction with some features aimed at amateur musicians, and some at
+music information retrieval researchers. It contains the Chordino,
+NNLS Chroma and Tuning plugins described below. Their main features are:
+
+* Chordino: a simple, no frills chord transcription method based on NNLS
+Chroma features,
+* NNLS Chroma: high-quality chroma features for harmony visualisation
+or further processing,
+* Tuning: an estimate of the 'concert pitch' tuning.
+
+
+Note to x86_64 users: if your VAMP host application can't seem to find
+the plugins, you may have to 'export VAMP_PATH=/usr/lib64/vamp'. The
+SBo vamp-plugin-sdk (v2.1, build 2) package at the time of this writing
+still defaults to using /usr/lib/vamp. Future builds of vamp-plugin-sdk
+should address this.