Loader and SoundManager scripts referenced in TextTyper class

Loader.cs

using UnityEngine;
using System.Collections;

public class Loader : MonoBehaviour {

	public GameObject gameManager;
	public GameObject soundManager;

	void Awake () {
		if (gameManager && GameManager.instance == null)
			Instantiate(gameManager);
		if (soundManager && SoundManager.instance == null)
			Instantiate(soundManager);
	}
}

SoundManager.cs

using UnityEngine;
using System.Collections;

public class SoundManager : MonoBehaviour {

	public AudioSource efxSource;
	public AudioSource musicSource;
	public static SoundManager instance = null;

	public float lowPitchRange = 0.95f;
	public float highPitchRange = 1.05f;

	void Awake () {
		if (instance == null)
			instance = this;
		else if (instance != this)
			Destroy (gameObject);
			
		DontDestroyOnLoad (gameObject);
	}

	public void PlaySingle (AudioClip clip) {
		efxSource.clip = clip;
		efxSource.Play();
	}

	public void RandomizeSfx (params AudioClip [] clips) {
		int randomIndex = Random.Range(0, clips.Length);
		float randomPitch = Random.Range (lowPitchRange, highPitchRange);

		efxSource.pitch = randomPitch;
		efxSource.clip = clips[randomIndex];
		efxSource.Play();
	}
}