How do you create sound packs?

[Lil Robot]

I'm wanting to make a sound pack for my <Insert Name here> build. But sadly, I don't know how to put a sound pack together. Can anyone help me out here? Your replies are appreciated.

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[Tom]

Open up an existing one and see how its done.

[Lil Robot]

Last time I tried that it failed..
But this time it worked. Thanks Tom, this helped out alot :D