const midi = require('midi')

let mo = new midi.Output()
let mi = new midi.Input()

mo.openVirtualPort("debug-out")
mi.openVirtualPort("debug-in")

mi.on('message', (deltaTime, message) => {
  // The message is an array of numbers corresponding to the MIDI bytes:
  //   [status, data1, data2]
  // https://www.cs.cf.ac.uk/Dave/Multimedia/node158.html has some helpful
  // information interpreting the messages.
  console.log(`midi in: ${message} d: ${deltaTime}`)
  mo.send(message)
})