I also tried to simplify the path, bypassing the scale object, made all boxes Integers and used join 4 @triggers -1 and unjoin 4. Same problem. It seem that fennel doesn't like lists...

Try this

I fixed the problem temporarily inserting a change object between unjoin and the integers boxes.

To really see what's coming out of the output, use [print] and observe the Max Window. Everything works as expected:

Hi Rick, Jean Francois, thank you very much, I can see it's working properly in the Max Window even if it's not showing on the message box... I still don't get why it's doing that, especially why it does work when I put a change object between the unjoin object and the integers... weird! Best!

- without your "change" object, you give four values to the four inputs of [funnel] each time you touch one of the numbers. That's because of your [join]/[unjoin] (same with [pack]/[unpack]). Because you are giving four numbers to each input of [funnel], [funnel] gives you four values (which print very fast, and you see just the last one in the [message]) - with [change], you are just filtering out numbers when they don't change, so you are forwarding to [funnel] only one number... Then you get only one list out.

Clair come de l'eau de roche, thanks Jean-François!!