Volume controls that work for the Arduino Leonardo

/* Arduino USB Keyboard HID - Media Controls that work, Volume up, volume down and .... mute!
 * Volume+/Volume-/Mute keys
 */

#include "HID-Project.h"

#define PIN_VOLUME_UP 5
#define PIN_VOLUME_DOWN 6
#define PIN_MUTE 7


void setup()
{
  Serial.begin(9600);
  pinMode(PIN_VOLUME_UP, INPUT);
  pinMode(PIN_VOLUME_DOWN, INPUT);
  pinMode(PIN_MUTE, INPUT);

  // enable internal pull-ups
  digitalWrite(PIN_VOLUME_UP, INPUT_PULLUP);
  digitalWrite(PIN_VOLUME_DOWN, INPUT_PULLUP);
  digitalWrite(PIN_MUTE, INPUT_PULLUP);

  // Sends a clean report to the host. This is important on any Arduino type.
  //Keyboard.begin();
  Consumer.begin();
}

void loop()
{
  if (digitalRead(PIN_VOLUME_UP) != 1) {
    //Keyboard.write(KEY_VOLUME_UP);
    Consumer.write(MEDIA_VOLUME_UP);
    //Keyboard.write(HID_KEYBOARD_VOLUME_UP);
    //Keyboard.write(KEY_MEDIA_VOLUME_INC);
    //Keyboard.println("Hello World!");
    Serial.println("Volume Up");
    delay(300);
    //digitalWrite(PIN_VOLUME_UP, LOW);
  }

  if (state = digitalRead(PIN_VOLUME_DOWN) != 1) {
    //Keyboard.write(KEY_VOLUME_DOWN);
    Consumer.write(MEDIA_VOLUME_DOWN);
    //Keyboard.write(HID_KEYBOARD_VOLUME_UP);
    //Keyboard.write(KEY_MEDIA_VOLUME_DEC);

    Serial.println("Volume Down");
    delay(300);
    //digitalWrite(PIN_VOLUME_DOWN, LOW);
  }
  if (digitalRead(PIN_MUTE) != 1) {
    //Keyboard.write(KEY_VOLUME_MUTE);
    //Keyboard.write(KEY_MUTE);

    Consumer.write(MEDIA_VOLUME_MUTE);
    //Keyboard.write(HID_KEYBOARD_MUTE);
    Serial.println("Mute");
    delay(300);
    //digitalWrite(HID_KEYBOARD_MUTE, LOW);
  }
}