// Your variable with a ArrayBuffer instance containing your MIDI file
var anyBuffer;

// Creating the MIDIFile instance
var midiFile = new MIDIFile(anyBuffer);

// Reading headers
midiFile.header.getFormat(); // 0, 1 or 2
midiFile.header.getTracksCount(); // n
// Time division
if(midiFile.header.getTimeDivision() === MIDIFileHeader.TICKS_PER_BEAT) {
	midiFile.header.getTicksPerBeat();
} else {
	midiFile.header.getSMPTEFrames();
	midiFile.header.getTicksPerFrame();
}

// MIDI events retriever
var events = midiFile.getMidiEvents();
events[0].subtype; // type of [MIDI event](https://github.com/nfroidure/MIDIFile/blob/master/src/MIDIFile.js#L34)
events[0].playTime; // time in ms at wich the event must be played
events[0].param1; // first parameter
events[0].param2; // second one

// Lyrics retriever
var lyrics = midiFile.getLyrics();
if ( lyrics.length ) {
	lyrics[0].playTime; // Time at wich the text must be displayed
	lyrics[0].text; // The text content to be displayed
}

// Reading whole track events and filtering them yourself
var events = midiFile.getTrackEvents(0);

events.forEach(console.log.bind(console));

// Or for a single track
var trackEventsChunk = midiFile.tracks[0].getTrackContent();
var events = MIDIEvents.createParser(trackEventsChunk);

var event;
while(event = events.next()) {
	// Printing meta events containing text only
	if(event.type === MIDIEvents.EVENT_META && event.text) {
		console.log('Text meta: '+event.text);
	}
}