The volume of the audio source (0.0 to 1.0).

	@script RequireComponent(AudioSource)
	function Start() {
		audio.volume = 0.2;
	}

using UnityEngine;
using System.Collections;

[RequireComponent(typeof(AudioSource))]
public class Example : MonoBehaviour {
    void Start() {
        audio.volume = 0.2F;
    }
}

import UnityEngine
import System.Collections

[RequireComponent(typeof(AudioSource))]
public class Example(MonoBehaviour):

	def Start() as void:
		audio.volume = 0.2F