Discrepancy in duration of the Notes

[Treata11]

Greetings @matsune

I've used your great package to create note-beams in my project.

These I call note beams :)

However, I've noticed that the duration of a parsed midi file varies a bit from other MIDISequencers (like Apple AVMIDIPlayer API) and thus the duration of each MidiNote inSeconds does not match the duration of notes that are played by the sequencer.

The difference is not usually that big, it's mostly around 0.1% - 1%.

So I wondered, why there's a slight difference while both data is derived from the same set of APIs?