I think I found a clue to why this isn't working.
I busted out the good old multi meter. This is all just voltage, right?
The QuNeo is putting out 5 volts for gate - as expected. And it's putting out 2.0 volts for middle c. I would have expected 1 volt, but I can think of a few reasons that it could be off a volt.
The Mini is putting out a good 5 volts for gate. But pitch out sends nothing! No voltage at all.
So this got me thinking I should check the Micro.
It's gate out and pitch out send nothing at all. No wonder this isn't working!
Should I think I have bad Brutes or am I missing something?