// Dont use delay on the filter.
    @script RequireComponent(AudioSource)
    @script RequireComponent(AudioChorusFilter)
    function Start() {
        GetComponent(AudioChorusFilter).delay = 0.1;
    }

using UnityEngine;
using System.Collections;

[RequireComponent(typeof(AudioSource))]
[RequireComponent(typeof(AudioChorusFilter))]
public class example : MonoBehaviour {
    void Start() {
        GetComponent<AudioChorusFilter>().delay = 0.1F;
    }
}

import UnityEngine
import System.Collections

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

    def Start():
        GetComponent[of AudioChorusFilter]().delay = 0.1F