Triads and Tetrads metrics from Pauwels & Peeters 2013 paper.
Templates for 7th chords
For 7th chords templates only fill 1 harmonic, not 3.
Minor fix in reduce
Tests for new metrics
10 bins per note is enough for tuning frequency deteciton.
Add one harmonic to 7th chords templates.
Use self-similarity for chroma
Better control over the train/test data generation parameters
Delay from beat times when calculating spectrogram
Always the simplest reduce to 1 value per note: only take the value in
the middle and cancel others.
Temporarily disable the test for unknown chords
Disable the test for 7th chords
Fixed the tests for shrink
Default spectrogram frequency resolution is now 36 rows per octave
instead of 60
Minor changes