I don't believe there is one. There is however, an Audio behavior you can use to control just about any parameter available in all of Motion with which you can build almost anything you can imagine. Here are some examples of the types of "visualizers" I've built (many of the descriptions contain instructions and/or links to project files).
Good beginner project: (instructions in the description/about section)
Yet Another (Ultra Simple) Visualizer - Motion - YouTube
Another fairly simple project (just a matter of adding an Audio behavior to the rotation of the indicator — I'm actually more of an advocate for 3D modeling in Motion):
3D VU - a simple 3D Motion model - YouTube
Not really a visualizer, but Audio behavior all the same
Motion Project: Oscilloscope (Demo with Project files) - YouTube
There's a two part tutorial
Apple Motion Tutorial: Build an Oscilloscope - YouTube
Apple Motion Tutorial: Oscilloscope pt2 (building a logic gate for a parameter) - YouTube
Strange music, strange effect 😉
A Serial Composition: 8812 Overture or If light could dance - YouTube
Some more possibilities:
Soulful Heart — an Apple Motion visualizer project - YouTube
Aleatoric Serial Music: Island Getaway - YouTube
Take Your Meditation! an Apple Motion project - YouTube
N Trance. An Apple Motion/Logic project featuring Native-Instruments Reaktor Spark - YouTube
... whatever you can imagine... really!
It doesn't matter how many Audio behaviors you use in your project, they won't make copies of the original audio - they simply creates keyframes. You can use different audio in each behavior (it has something like a drop zone) and they become even more powerful when you can break down your music to instrument tracks.
Some visualizers only basically match the tempo of a piece and use oscillators to create a visual effect that matches that tempo in the audio. [Motion also has an Oscillate parameter behavior.]
Have a specific project in mind?