Have discovered an awesome audio analyzer - Sonic Visualiser from Queen Mary University, London. Free and open-source, supports V-amp plug-ins etc. FFT, spectragraph, pitch correlation, polyphonic music analyzers (will detect key, chord changes, time signature, etc), audio-to-MIDI, plus low-level analysis (onset detection, zero cross-point, spectral centroid, harmonic content, etc.) Can load multiple files at once to compare against each other. Will also output annotations of the analysis as text so you can read the frequencies present in the audio as well as see them.
http://www.sonicvisualiser.org/



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