void Update(){
        if (myTransform.position.y <= 1)
   myTransform.audio.Play();
      }

public class BrickScript : MonoBehaviour    

{
    //myTransform это падающий объект, boom - это префаб со звуком
           private Transform myTransform;
           public Transform boom;    
        
         void Update(){
         if (myTransform.position.y > 1)    
            myTransform.position -= Vector3.up * fallspeed * Time.deltaTime;    
         if (myTransform.position.y <= 1)
            ypos =1 - myTransform.position.y;
            myTransform.position =myTransform.position +new Vector3(0,ypos,0);
         
          // Создание префаба boom в сцене при достижении Y=1
         if (myTransform.position.y <= 1)
            Instantiate(boom, myTransform.position,Quaternion.identity);
         }
}

using UnityEngine;
using System.Collections;

public class Death : MonoBehaviour {

    
  IEnumerator DestroySoundIE () {
   
         audio.Play();
   
  gameObject.renderer.enabled = false;
   
         gameObject.collider.enabled = false;
   
         while (audio.isPlaying) yield return null;
   
         Destroy(gameObject);
   
}
   
void OnTriggerEnter (Collider bullet) {
                 
         if (bullet.gameObject.tag == "Bullet") {
   
                 if (audio != null)  
     StartCoroutine("DestroySoundIE");
                 else Destroy(gameObject);
   
         }
  }
}

var plrCam : Camera;
var moveSpeed : int = 5;
var rotateSpeed : int = 1;
var targPos : Vector3;

function Update () {     
       if(Input.GetMouseButtonDown(0))  {
               var ray = plrCam.ScreenPointToRay (Input.mousePosition);
               var hit : RaycastHit;
           if (Physics.Raycast(ray, hit))
               targPos = hit.point;
           }
               var targDir = targPos - transform.position;
               var targDist = Vector3.Distance(transform.position, targPos);
           if (targDist > 1.5) {
               transform.rotation = Quaternion.Slerp (transform.rotation, Quaternion.LookRotation(targDir), rotateSpeed * Time.deltaTime);
               transform.rotation.z = 0;  transform.rotation.x = 0;
               transform.Translate(Vector3.forward * moveSpeed * Time.deltaTime);
       }
}