The loop source is a periodic effect.It's used for tests and allows the user to create a wave and generate values from that wave.

The wave is defined on the fields. You can select the type of wave and adjust the amplitude and vertical shift of the wave.

You can add the amount of loop modules you want. All of them use the same clock to keep them synchronised. So when you adjust the period and phase shift, you do it relative to the same clock. This allows you to define some interesting movements on the rig, by using more than one loop module.

Because of the sync, you should be careful changing those values, since they can generate sudden moves on the wave and if you have the rig connected, it might produce a violent move of the rig.

On the right column, select the values you want to feed with wave.
By default, rotation positions are selected.
You can select the values you want without limits, but all of them get the same value.

There's a filter field where you can apply a filter to the generated wave and modify it's result.
In the image we can see a gain of 0.5 applied to the wave.

The noise source, allows the user to create random noise.

The noise is defined on the fields.You can select the maximum range of the generated value, it's center (value around which we generate the random value) and the interval/frequency we update the value.

You can add the amount of noise modules you want.

On the right column, select the values you want to feed with the noise.
By default, translacional accelerations are selected.

The noise generated can be equal or different on the selected values depending on the check box selection (use same noise for all values).

There's a filter field where you can apply a filter to the generated noise and modify it's result.
In the image, we can see a smooth filter in action.