Roll A Ball Sound

So I finished the roll a ball tutorial now im trying to figure out how to play sounds when the ball is rolling, hits the wall with different pitches, and to play a you win! sound when all 12 have been collected. Ive surfed the internet for a while and nothing hasn’t been able to work other than coin pick up sounds if anyone doesn’t mind explaining how to do this that would be appreciated. Here is the script I have for the player(ball).

Thanks in advanced!

using UnityEngine;
using UnityEngine.UI;
using System.Collections;

public class PlayerController : MonoBehaviour {

	public float speed;
	public Text countText;
	public Text winText;
	private Rigidbody rb;
	private int count;
	private AudioSource myAudio;

	void Start ()
		rb = GetComponent<Rigidbody> ();
		count = 0;
		SetCountText ();
		winText.text = "";
		myAudio = GetComponent<AudioSource> ();


	void FixedUpdate ()
		float moveHorizontal = Input.GetAxis ("Horizontal");
		float moveVertical = Input.GetAxis ("Vertical");

		Vector3 movement = new Vector3 (moveHorizontal, 0.0f, moveVertical);

		rb.AddForce (movement * speed);


		void OnTriggerEnter(Collider other)	
		if (other.gameObject.CompareTag ("Pick Up")) {
			other.gameObject.SetActive (false);
			count = count + 1;
			SetCountText (); 
			myAudio.Play ();

		void SetCountText()
			countText.text = "Count: " + count.ToString ();
			if (count >= 12)
				winText.text = "You Win!";

Hey, if you got idea how to play sound on pickup, what’s the problem? It’s clearly logic stuff, just ask yourself question and answer it:
You want to play sound:

  • when player wins, so where do you
    have win condition? You have it
    already, just put play sound in it. If you would to have different AudioClip for it, change it by this method

  • when player hits the wall, so you
    need condition to check collision for
    hitting wall. You can achieve this by
    OnCollisionEnter method.
    Mechanic would be very similiar to
    your trigger, but you want to check
    for wall, not for pick up (and
    obviously you won’t increment
    “count”). Just before playing sound
    you want to change pitch, so do
    it. And remember to have properly tag on wall objects.