Stopping a Sound when Player stops moving

I'm trying to find the right way to script how to shut off my audio source when my character stops moving, performs another action, etc. I'm trying my own stuff since I finished the Ruby 2D tutorial, and managed to get the walking sound to play somewhat appropriately. Here is the condensed code:

Code (CSharp):

1. public class RubyController : MonoBehaviour
2. {
3.  
4. float walkingTimer;
5. bool isWalking = false;
6. Vector2 lookDirection = new Vector2(1, 0);
7. AudioSource audioSource;
8. public AudioClip acWalk;
9.  
10. void Start ()
11. {
12.      audioSource = GetComponent<AudioSource>();
13. }
14.  
15. void Update()
16. {
17.         float horizontal = Input.GetAxis("Horizontal");
18.         float vertical = Input.GetAxis("Vertical");
19.  
20.         Vector2 move = new Vector2(horizontal, vertical);
21.  
22.         if(!Mathf.Approximately(move.x, 0.0f) || !Mathf.Approximately(move.y, 0.0f))
23.         {
24.             lookDirection.Set(move.x, move.y);
25.             lookDirection.Normalize();
26.             if(!isWalking)
27.             {
28.                 isWalking = true;
29.                 PlaySound(acWalk);
30.                 walkingTimer = 1.2f;
31.             }
32.         }
33.  
34.    if (isWalking)
35.         {
36.             walkingTimer -= Time.deltaTime;
37.             if (walkingTimer < 0)
38.             {
39.                 isWalking = false;
40.             }
41.         }
42.  
43. public void PlaySound(AudioClip clip)
44.     {
45.         audioSource.PlayOneShot(clip);
46.  
47.         while(Input.GetKeyDown(KeyCode.A) || Input.GetKeyDown(KeyCode.LeftArrow))
48.         {
49.             Debug.Log("While");
50.  
51.         }
52.         Debug.Log("After While");
53.  
54.         audioSource.Stop();
55.     }

Like I said, I cut out most of the code that should be irrelevant here. The while statement, unfortunately, caused an infinite loop, so I know that isn't right. My idea is that I should be testing for a condition where the player's input axis or key is null or is no longer the normal movement keys. Forgive my poor C# literacy.

 

How about this?

isWalking = !Mathf.Approximately(move.sqrMagnitude)

 

Thanks, I will give that a try