Dualchord Expander

[Caniffe]

I’m having difficulty controlling the Dualchord with a MIDI keyboard. I’ve got a Nerdseq with the MIDI TRS expander, and the DualChord (running firmware v1.2) on NSA4. In the test I’m running, there is a DualChord track on Track 4 of the sequence. I’m using an Arturia Keystep mk2 into the MIDI expander, set to channel 1. 

In the MIDI/I2C setup, I can set the MIDI channel 1 destination to Track 4 input. In this case I seem to get a monophonic response. 

In Mapping, I’ve tried this:
MIDI->TC 1->NOTE > DUAL->NSA4->NOT1
MIDI->TC 1->GATE > DUAL->NSA4->OOF1
MIDI->TC 1->NOTE > DUAL->NSA4->NOT2
MIDI->TC 1->GATE > DUAL->NSA4->OOF2
MIDI->TC 1->NOTE > DUAL->NSA4->NOT3
MIDI->TC 1->GATE > DUAL->NSA4->OOF3
MIDI->TC 1->NOTE > DUAL->NSA4->NOT4
MIDI->TC 1->GATE > DUAL->NSA4->OOF4

This seems to produce a weird kind of 3 voice polyphony the goes to 1 voice when the 4th key is played. 
It does not simply play 4 notes lines if hoped it would. 

I also haven’t figured out how to use a MIDI controller to fire the Dualchord’s trigger outputs. 

Full confession: I’ve only just started figuring out the possibilities of mapping. MIDI is a mystery to me and I am certain I’m doing this wrong. If there is documentation of this someplace I missed, please just point me in the right direction. Thanks so much.