It's nice to hear from you.
Even if I have not spent as much time on Siren as I would have liked, the work continues (will it ever end ?).
The "Expression filters" feature has been implemented. The only missing element is an explained example.
Many other smaller new things, bug fixes and improvements should be part of the next version.
The tests will require a lot of efforts and I tend to postpone the task by implementing other changes.
The next feature I will maybe add to the release after the next is allowing the user to create its own variables and associate code to them. It would written in a scripting language.
The one that looks interesting is Lua. Please, give me your ideas about this.
I hope that everything goes well for you.
Thanks again for your interest in this little project.