Microphone Input to Spawn object

I'm following a tutorial on this site here: **http://www.kaappine.fi/tutorials/using-microphone-input-in-unity3d/** But the code is out of date and brings bace the following errors after Unity Upgraded it:

Assets/Scripts/MicrophoneInput.cs(13,49): error CS0103: The name AudioInputDevice' does not exist in the current context Assets/Scripts/MicrophoneInput.cs(13,37): error CS1502: The best overloaded method match for UnityEngine.Microphone.GetPosition(string)' has some invalid arguments

Assets/Scripts/MicrophoneInput.cs(13,37): error CS1503: Argument #1' cannot convert object' expression to type `string'

 using UnityEngine;
 using System.Collections;
 
 [RequireComponent(typeof(AudioSource))]
 public class MicrophoneInput : MonoBehaviour {
     public float sensitivity = 100;
     public float loudness = 0;
 
     void Start() {
         GetComponent<AudioSource>().clip = Microphone.Start(null, true, 10, 44100);
         GetComponent<AudioSource>().loop = true; // Set the AudioClip to loop
         GetComponent<AudioSource>().mute = true; // Mute the sound, we don't want the player to hear it
         while (!(Microphone.GetPosition(AudioInputDevice) > 0)){} // Wait until the recording has started
         GetComponent<AudioSource>().Play(); // Play the audio source!
     }
 
     void Update(){
         loudness = GetAveragedVolume() * sensitivity;
     }
 
     float GetAveragedVolume()
     { 
         float[] data = new float[256];
         float a = 0;
         GetComponent<AudioSource>().GetOutputData(data,0);
         foreach(float s in data)
         {
             a += Mathf.Abs(s);
         }
         return a/256;
     }
 }