Tutorial. How to create MIDI synthesizer with MIDI API and Node JS https://medium.com/nebo-15/tutorial-how-to-create-midi-synthesizer-with-midi-api-and-node-js-48d41c162009

midi-api_step7_client.js

client.on('open', function () {
 MIDIStream = client.createStream();
});
client.on('stream', function (stream) {
 stream.on('data', handleReceiveAudioData);
 stream.on('end', handleEndAudioStream);
}