AudioSource.mute

Description

Un- / Mutes the AudioSource. Mute sets the volume=0, Un-Mute restore the original volume.

    // Mutes-Unmutes the sound from this object each time the user presses space.

    function Update() {
         if(Input.GetKeyDown(KeyCode.Space)) {
            if(audio.mute)
                audio.mute = false;
            else
                audio.mute = true;
        }
    }

// Mutes-Unmutes the sound from this object each time the user presses space.
using UnityEngine;
using System.Collections;

public class ExampleClass : MonoBehaviour
{
    AudioSource audioSource;

    void Start()
    {
        audioSource = GetComponent<AudioSource>();
    }

    void Update()
    {
        if (Input.GetKeyDown(KeyCode.Space))
            audioSource.mute = !audioSource.mute;
    }
}