How to create a button in VR with PUN?

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Hi all,

I've been working on a solution for weeks now and I think it's time to reach out. I'm trying to make a button that plays a sound when pressed by a controller, everyone will hear that sound. Using VRTK and PlayoVR, I'm able to make a non-networked version where the player can put their hand through a cube, click the trigger from the controller, and it makes a sound.

This is the code for that cube:
namespace VRTK.Examples
{
    using UnityEngine;


    public class Whirlygig : VRTK_InteractableObject
    {
        public GameObject AudioSource;
        public AudioSource LeftSpeaker;

        public override void StartUsing(VRTK_InteractUse currentUsingObject = null)
        {
        AudioSource.GetComponent<AudioSource>().Play();
        }
    }
}
Where I get lost is how to network it. This is what I have:
namespace PlayoVR
{
    using UnityEngine;
    using VRTK;
    using UnityEngine.Video;
    using NetBase;

    public class PlaySync : Photon.MonoBehaviour
    {
        public AudioSource LeftSpeaker;
        public GameObject Whirlgig;
        private bool StartUsing;

        // Use this for initialization
        void Awake()
        {
            GetComponent<VRTK_InteractableObject>().InteractableObjectUsed += new InteractableObjectEventHandler(DoPlay);
        }

        void DoPlay(object sender, InteractableObjectEventArgs e)
        {
            StartUsing = true;
        }

        // Update is called once per frame
        void Update()
        {
            // Handle firing
            if (StartUsing)
            {
                CmdPlay();
                StartUsing = false;
            }
        }

        void CmdPlay()
        {
            photonView.RPC("NetPlay", PhotonTargets.All);
        }

        [PunRPC]
        void NetPlay()
        {
            LeftSpeaker.Play();
        }
    }
}
It does not work. I'll put my hand in the cube, press the trigger and nothing happens. If anyone can provide any help, I'd be very grateful.

Kind regards,
TheMusiken