How can I call an audio clip in the update without it distorting?,How can i play an audio clip in the Update function?

Hello,

I am fairly new to coding and have been working on a little rolling ball game for a few months now and am stuck on adding a rolling sound to the ball when it moves. I have all my audio files in an audio manager script and call them when they need to be ran. I have a script that deals with the aspects of the balls movement that i would like to call the rolling clip. I have a boost function for the ball that the sound file I have works fine in the function. I just seem to have no idea how to incorporate the rolling sound when the ball moves. I keep going back to the update. Any help would be fantastic!

here is the script for the ball.

 public class Motor : MonoBehaviour 
 {
     private const float TIME_BEFORE_START = 3.0f;
     public float moveSpeed = 5.0f;
     public float drag = 0.5f;
     public float terminalRotationSpeed = 25.0f;
     public VirtualJoystick moveJoystick;
 
     public float boostSpeed = 5.0f;
     public float boostCooldown = 2.0f;
     private float lastBoost;
 
     private Rigidbody controller;
     private Transform camTransform;
 
     private float startTime = 0.0f;
 
     public bool isRolling;
 
     private void Start()
     {
         
         lastBoost = Time.time - boostCooldown;
         startTime = Time.time;
 
         controller = GetComponent<Rigidbody> ();
         controller.maxAngularVelocity = terminalRotationSpeed;
         controller.drag = drag;
 
         camTransform = Camera.main.transform;
 
         isRolling = false;
 
     }
 
     private void Update()
     {
         if (Time.time - startTime < TIME_BEFORE_START)
             return;
         
         Vector3 dir = Vector3.zero;
 
         dir.x = Input.GetAxis ("Horizontal");
         dir.z = Input.GetAxis ("Vertical");
 
         if (dir.magnitude > 1) 
         {
             dir.Normalize ();
         }
 
         if (moveJoystick.InputDirection != Vector3.zero) 
         {
             dir = moveJoystick.InputDirection;
 
         }
             
         // Rotate our direction vector with camera
 
         Vector3 rotatedDir = camTransform.TransformDirection (dir);
         rotatedDir = new Vector3 (rotatedDir.x, 0, rotatedDir.z);
         rotatedDir = rotatedDir.normalized * dir.magnitude;
 
         controller.AddForce (rotatedDir * moveSpeed);
 
 // code I have to add rolling sound if the ball is moving
         if (moveSpeed >= 1f) 
         {
             if (!isRolling) {
                 FindObjectOfType<AudioManager> ().Play ("Rolling_1");
                 isRolling = true;
             } else
                 isRolling = false;
                 FindObjectOfType<AudioManager> ().Stop ("Rolling_1");
         }
 
     }
 
     public void Boost()
     {
         if (Time.time - startTime < TIME_BEFORE_START)
             return;
 
         if (Time.time - lastBoost > boostCooldown) 
         {
             lastBoost = Time.time;
             controller.AddForce (controller.velocity.normalized * boostSpeed, ForceMode.VelocityChange);
             FindObjectOfType<AudioManager> ().Play ("Boost");
         }
     }
 }