Median filters pitch estimation.
Pitch estimation benchmark.
Normalized cross correlation benchmark.
Restore GL rendering.
PDF GL rendering optimization.
Fix low pitch detection.
Restore maximum spectrum peak method (~ correlation with sin) for
comparison.
Inserts fmax/2, fmax/3, fmax/4 candidates.
Maximum spectrum peak + cross correlation method.
Final maximum peak + crosscorrelation of f,f/2,f/3,f/4.
Results: All notes except lowest and highest are estimated correctly.