Add sound effects

[SebastianJay]

Start adding in the sound effects we have to the player and environment objects. For certain objects it will be sufficient to have a script implementing OnTriggerEnter2D or OnCollisionEnter2D calling AudioSource.Play()

For the player, it should be a bit more sophisticated - I'm thinking of having a separate script which is a container for all the different AudioSources for jumping, bouncing, etc. And PlayerBallControl would call these different AudioSources as necessary.
Consider using http://answers.unity3d.com/questions/175995/can-i-play-multiple-audiosources-from-one-gameobje.html for some help.