I'm scratching my head wondering what's happening with an external i have written. The first 6 inlets work as expected, but not getting any response from inlets 7 and 8.
I cut my code down as much as possible, and made a really simple external which just adds signals and outputs the result, but still getting this same behaviour.

In the howTo guide on writing externals, it mentions that an object can only be given a maximum of 6 arguments, or else needing a GIMME, so i was wondering if perhaps that 6 argument limit is somehow related here?