Hello,
Long time moog fan new virgin moog owner 
I recently bought the new reissued minimoog model d, and I would like to use it as an external effects processor but not sure how to do this. I am on Logic Pro X, if someone can give me a step by step from actual hardware wiring to software i/o setting I would greatly appreciated.
I don’t use Logic, Nuendo here but the ideas are the same. You need to send a signal out of your audio card hardware to the input of the Moog. I do this with an aux send that is then routed to a physical output on my audio card. From there, it’s just a matter of getting the signal to the Moog input. Once you have the wiring all setup don’t forget that you need to have a key pressed on the Moog to hear the sound being fed into it. I used to use a piece of tape on my old original Model D to hold a key down while I tweaked the various sound shaping tools. The Sub 37 has a latch setting on the Amg EG though which makes it a little easier.
Hope this helps.
Thank you for the reply, my mistake was not holding one of the keys down