Noise.cs Script?

In this project, SmoothRandomPosition.js says,

// This script is placed in public domain. The author takes no responsibility for any possible harm.

// Moves the object along as far as range units randomly but in a smooth way.
// This script requires the Noise.cs script.

So, where is Noise.cs script?

It’s a mistake - the file is actually called Perlin.cs and is located in the project’s Plugins folder.

i have a question to all, who know and use this smoothrandomposition.js - script!!!
in my example there is the following line:

transform.position = position + Vector3.Scale(SmoothRandom.GetVector3(speed), range);

range (for this example) is (1,1,1).
position of my gameObject is (0,0,0).
The PerlinNoise is working fantastic, but im not able to change the line above, to have the random-effect around the init-position (here: 0,0,0)
I mean in a range of -1 to 1 and not 0 to 1.

can someone help me?
thanx a lot!!!