After way to much time, I’ve finally managed to upload a OSX universal binary of the NNLS Chroma Vamp library. If you’re using OSX and NNLS Chroma, this should make it significantly faster… thanks to the tech miracle that is compiler optimisation. General information on NNLS Chroma and Chordino can still be found on the Isophonics website, and the open source repository is on the code.soundsoftware.ac.uk website.