Volume of original signal to pass to output. 0.0 to 1.0. Default = 1.0.

	// Listen to only Echo (not the original audio source)
	// Set the wet mix to 0 and you will disable the echo.
	@script RequireComponent(AudioSource)
	@script RequireComponent(AudioEchoFilter)
	function Start() {
		GetComponent(AudioEchoFilter).wetMix = 1.0;
		GetComponent(AudioEchoFilter).dryMix = 0.0;
	}

using UnityEngine;
using System.Collections;

[RequireComponent(typeof(AudioSource))]
[RequireComponent(typeof(AudioEchoFilter))]
public class Example : MonoBehaviour {
    void Start() {
        GetComponent<AudioEchoFilter>().wetMix = 1.0F;
        GetComponent<AudioEchoFilter>().dryMix = 0.0F;
    }
}

import UnityEngine
import System.Collections

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

	def Start() as void:
		GetComponent[of AudioEchoFilter]().wetMix = 1.0F
		GetComponent[of AudioEchoFilter]().dryMix = 0.0F