MIDI routing with Knot

I have 4 synths with analogue MIDI ins and outs with unique send/receive channels. I have a Knot and some Grids which I’d like to use to recall specific MIDI routing. Example: Synth#1 MIDI out to Synth#4 MIDI input for song#1; Synth#2 MIDI out > Synth#3 MIDI in for song#2; etc.

I couldn’t work that out on the Grid Editor, has anyone achieved this type of this and can kindly show me how? Thaaaaanks!