// Process only once the signal and dont introduce feedback to the filter.

@script RequireComponent(AudioSource)
@script RequireComponent(AudioChorusFilter)

function Start() {
    GetComponent(AudioChorusFilter).feedback = 0;
}

using UnityEngine;
using System.Collections;

[RequireComponent(typeof(AudioSource))]
[RequireComponent(typeof(AudioChorusFilter))]
public class example : MonoBehaviour {
    void Start() {
        GetComponent<AudioChorusFilter>().feedback = 0;
    }
}

import UnityEngine
import System.Collections

[RequireComponent(AudioSource)]
[RequireComponent(AudioChorusFilter)]
class example(MonoBehaviour):

    def Start():
        GetComponent[of AudioChorusFilter]().feedback = 0