Effects loop and using midi

Hi folks,

If any of you would be so kind, i’m going to need someone to walk me through using the 2nd input /output as an fx loop.

I also need to know how to change the pedal that will be in the loop via midi.
What utility/s will I need to utilise in order to control pc /cc changes? Is it a case of simply using midi learn on it?

Specifically this is what I want to do…

Mod duo input 1 > Elektron Analog Drive (in the mod duo loop)
How can i mix the sound of the Elektron Drive with the dry bass sound ?
Then also how do I change the presets on the Elektron Analog Drive via the mod duo?

Many thanks in advance.