As one of Vuo's developers, I work on Vuo's engine (the thing that makes compositions run), work on nodes, and write documentation. You'll see me on the forums answering people's questions about Vuo.
I enjoy using Vuo to make live music visuals. My hope for Vuo is that it will grow into a community of people of diverse backgrounds and identities making lots of different artistic, useful, unique, goofy, beautiful, crafty, wonderful compositions.
Estoy practicando para ser competente en español. Si publicas en el foro en español, trataré de responder en la misma manera.
Your reasoning about the Fire on Start and Spin Off Event is mostly correct. But here is the missing part: When the event from Fire on Start reaches Smooth with Duration, the input port that it hits has a wall, so the event is blocked. In other words, the event doesn't pass through to the output port of Smooth with Duration.
The first event that does go all the way through Smooth with Duration comes from Render Layers to Window : Requested Frame, about 1/60 second later.