 #include <Wire.h>
 #include <Adafruit_Trellis.h>
 #include <Adafruit_UNTZtrument.h>
+#include "MIDIUSB.h"
 
 #define LED     13 // Pin for heartbeat LED (shows code is working)
 #define CHANNEL 1  // MIDI channel number

  untztrument.writeDisplay();
}

void loop() {
  unsigned long t = millis();
  if((t - prevReadTime) >= 20L) { // 20ms = min Trellis poll time

    prevReadTime = t;
    digitalWrite(LED, ++heart & 32); // Blink = alive
  }
}
