MIDI debug app helper

mididebug.js

@@ -0,0 +1,16 @@
+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)
+})