jit.gl.pix inputs and Vsynth

I'm digging around the vsynth package and looking at the video mixers, trying to edit one so I can expand on its inputs. I've tweaked some of the package's innards before to get what I needed but this one is giving me more trouble. I basically need to take it from 6 to 10 inputs, so I add 4 more of everything, new "in"s to the route object at the top, everything. But once I get to the jit.gl.pix object at the bottom I can't figure out how to expand the inputs from 6 to 10. I've tried attaching an attrui to it and found inputs (which reads back as 6) but increasing it does nothing. this is the original

And here's how I altered it, up to the point where I'm stuck with the jit.gl.pix thing (which I'm pretty sure is the last step for what I need)