Minimal Note Duration - this parameter can help to discard short wrong notes from the resulting MIDI file. The algorithm simply deletes all of the notes shorter than this value. Appropriate value depends on the music genre; generally it lies in the range of 20..150 ms.
Note detection method - this switch determines the second-step algorithm type. Peak is a new method, and Local is an older one, but you can try both.
Polyphony selects the number of voices it the output file. This parameter is treated differently by the two second-step algorithms, so there are separate controls for each of them.
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