SoundManager

using UnityEngine;
using System.Collections;

// This is a SoundManager. Everything audio in the project will be managed through here.
// Clips can be played calling the appropriate functions in the code and assigning the audio clips in the Unity Editor.
// For info on the various functions available please check the comments in this file or look in the documentation.

public class SoundManager_01 : MonoBehaviour {

	public AudioSource sfxSound;				// Sound source for SFX
	public AudioSource msxSound;				// Sound source for Music
	public SoundManager_01 instance = null;		// instance of sound manager value, set to null

// In the Awake function we check for multiple instances of the SoundManager.
// For performance optimization and to avoid conflicts we will destroy all the SoundManager objects that are not this.

	void Awake (){
		// check if there are no instances of the sound manager
		if (instance == null)
			// in this case set it to this
			instance = this;

		// if there is already an instance of the sound manager, but it's not set to this
		else if (instance != this)
			// destroy it.
			Destroy (gameObject);
	}

// From here on we will define the different functions needed...
	
// The first function we need is the play function for a single sound.
	public void PlaySingleSound (AudioClip clip){
		// assign the clip passed in to the sfx sound source
		sfxSound.clip = clip;

		// and play it.
		sfxSound.Play();
	}

// The second function plays a random sound from an array of sounds, randomized for pitch and volume
	public void PlayRandomSound (float minPitch, float maxPitch, float minVolume, float maxVolume, params AudioClip[] clips){

		// generating a random number to use as index selector for play
		int randomNumber = Random.Range (0, clips.Length);

		// assign the clip to our sfx source
		sfxSound.clip = clips[randomNumber];

		// support for random pitch
		AudioPitchRandomizer (sfxSound, minPitch, maxPitch);
			
		// support for random volume
		AudioVolumeRandomizer (sfxSound, minVolume, maxVolume);

		// and play it
		sfxSound.Play ();
	}

// Function for pitch randomization functionalities
	private float AudioPitchRandomizer (AudioSource sfxSource, float minPitch, float maxPitch){

		// generating a random multiplier for pitch, in the [minPitch, maxPitch] range.
		float randomPitch = Random.Range (minPitch, maxPitch);

		// scaling the pitch of the sound source by its multiplier
		sfxSource.pitch *= randomPitch;

		// return it to the caller
		return sfxSource.pitch;
	}

// Function for volume randomization functionalities
	private float AudioVolumeRandomizer (AudioSource sfxSource, float minVol, float maxVol){

		// generating a random multiplier for volume, in the [minVol, maxVol] range.
		float randomVolume = Random.Range (minVol, maxVol);

		// scaling the volume of the sound source by its multiplier
		sfxSource.volume *= randomVolume;

		// return it to the caller
		return sfxSource.volume;
	}
}