Errors at really basic command.

Code (CSharp):

1. public AudioClip fireSound;

Declared on top, I haven't dragged the thing yet, but I will as soon as error goes away.
In middle of Update, after an correct if and all the checked statements that work perfectly.

Code (CSharp):

1. GetComponent<AudioSource>().Play(fireSound);

Producing errors:
Assets/Scripts/FireBullet.cs(25,53): error CS1502: The best overloaded method match for `UnityEngine.AudioSource.Play(ulong)' has some invalid arguments
and
Assets/Scripts/FireBullet.cs(25,53): error CS1503: Argument `#1' cannot convert `UnityEngine.AudioClip' expression to type `ulong'

Then tried

Code (CSharp):

1. audio.GetComponent<AudioSource>().Play(fireSound);

Assets/Scripts/FireBullet.cs(25,25): error CS0619: `UnityEngine.Component.audio' is obsolete: `Property audio has been deprecated. Use GetComponent<AudioSource>() instead. (UnityUpgradable)'

Assets/Scripts/FireBullet.cs(25,59): error CS1502: The best overloaded method match for `UnityEngine.AudioSource.Play(ulong)' has some invalid arguments

and

Assets/Scripts/FireBullet.cs(25,25): error CS0619: `UnityEngine.Component.audio' is obsolete: `Property audio has been deprecated. Use GetComponent<AudioSource>() instead. (UnityUpgradable)'

Any help requested please.

 

RTFM...

http://docs.unity3d.com/ScriptReference/AudioSource.Play.html

What you're probably meaning to use is PlayOneShot:

http://docs.unity3d.com/ScriptReference/AudioSource.PlayOneShot.html

 

, I see what you did there.

 

Just pointing out that I meant that in a joking way. That was the sort of bug you could have looked at for hours and not spotted