Here the actual project, saved you a click:

https://valent-in.github.io/pulseq/

... like you use the application in a web browser here, the main link is to the source code.

This is an incredibly fun thing to play with. Especially nice to have an arrangement session which many similar apps are missing

Is there an irony to the phrase "virtual analog"?

No there is not, it's been a thing since the 90s.

https://en.wikipedia.org/wiki/Analog_modeling_synthesizer