Maybe this old thread will help you understand it a bit more:
Basically, the device just takes the inputs from other meta devices, blends them together based on the weights you choose, and outputs a new meta signal that is a mixture of the three inputs. You can use it for a variety of interesting things, such as adding a small amount of randomisation to the smooth output from an LFO, or to gradually mix between different devices over certain parts of your song, etc.
