Expose the method that generates the default sequence of beats
Set path to Vamp host, eta parameter for log transform, and whether to
use tuning frequency estimation or not via chordest.properties.
Read eta parameter of log transform from chordest.properties. More
accurate work with different beat time providers and transform
providers in WaveFileSpectrumDataProvider.
Minor improvements and cleanup
Don't read wave data when beat time is negative (at the beginning of the
file due to window shift).
Unit test fixes
Read eta for log transform from chordest.properties