Here’s a screenshot of it’s composition interface:
It’s surprising that there aren’t more tools or apps with this approach, but outside of visualizations like Malinowski’s music machine... youtube.com/watch?v=OxM--m…
...there’s not much in the way of visual-first creative tools.
Anyway, the UPIC book is available as a free PDF. It’s worth browsing and the history of UPIC’s predecessors is fascinating.