Footsteps, landing sounds when jumping (javascript)

I'm using a simple first person controller for teaching a class in game audio. I'm using Unity 4 since the school hasn't updated to 5 yet. The script I've been using has worked fine: it gives me a variable that allows me to adjust the footstep speed:

 var footStepSounds : AudioClip[]; //array
 var stepLength = 0.3;
 function Awake () //this is so we load up the sounds right away
 
 {
     PlayFootstepSounds();
 }
 
 //at bottom:
 
 function PlayFootstepSounds()
 {
     var controller : CharacterController = GetComponent(CharacterController);
 
 while (true)
 {
     if (controller.isGrounded && controller.velocity.magnitude > 0.3)
     {
         audio.clip = footStepSounds[Random.Range(0, footStepSounds.length)];
         audio.Play();
         yield WaitForSeconds (stepLength);
     }
     else
         {
             yield;
         }
     }
 }

However, when jumping, I would like to have a landing sound before the footsteps resume. I looked around the forums here and found a script that I modified:

  var footStepSounds : AudioClip[];
  var landSound : AudioClip;
  var moveSpeed : float = 0.3;
  
  private var hasJustLanded = true; 
     
  function Awake()
  {
      //PlayFootStepSounds();
  }
  function Start () {
      
   
  }
  function Update(){
  PlayFootStepSounds();
  
  }
  function PlayFootStepSounds()
  {
       var controller : CharacterController = GetComponent(CharacterController); 
      var isMoving = Input.GetKey("w") || Input.GetKey("a") || Input.GetKey("s") || Input.GetKey("d");
      if (controller.isGrounded) {
          if (isMoving) {
              Debug.Log("I'm walking");
              if (!audio.isPlaying) {
                   audio.clip = footStepSounds[Random.Range(0, footStepSounds.length)];
                  audio.Play();
                  yield WaitForSeconds (moveSpeed);
              }
          }
          else if (audio.isPlaying)
          { 
              audio.Stop();
          }
          
          if (!hasJustLanded) {
              hasJustLanded = true;
              Debug.Log("yo I just landed, where you at?");
              AudioSource.PlayClipAtPoint(landSound, transform.position);
              Debug.Log("BOOM");
          }
      }
      else {
          if (audio.isPlaying)
          { 
              audio.Stop();
          }
          Debug.Log("yo check dis out am flyin! :D");
          hasJustLanded = false;
      }
  }
 

The problem is that I can't adjust the moveSpeed, or rather my adjustments don't work. I'm fairly new to scripting, so apologies if this is really simple, but if anyone can help out I would greatly appreciate it!