ds1 Global channel option?

Hi I'm trying to replicate the default midi mapping for the Korg nanoKontrol Studio (nKS) using the ds1 so that I can control the mixer in Korg Gadget on the iPad.

There is no midi learn mode for the mixer in Gadget but the nanoKontrol Studio (nKS) is able to control the mixer out of the box so I though that if I replicated the default midi mapping of the nKS in the ds1 I'd be able to use the ds1 instead as I don't own an nKS and frankly I'd much rather use the ds1!

So it seems that the only hurdle is that there doesn't seem to be a 'global' midi channel option in the ds1 editor as there is in the nKS editor.

For example

The fader for channel strip 1 in the mixer is set to the following in the nKS software:
Midi channel=global
CC Number=4

Is there a way to so this on the ds1? It seems that I have to set it to any channel from 1 to 16 but no option for a channel called global in the dropdown as in the nKS editor.

Any help much appreciated
Alex