I have a question. Using a nord in logic. I have the nord connected via USB to the Mac. At the same time, a midi interface connects to the speakers, and a Jack cable is attached to the instrument input of the midi interfaces. Until then I think ever

What are you trying to do with your nord keyboard? Use it as a midi keyboard or record the audio that it produces. Or both.

Your termanolgy is very confusing. You cannot attach midi interface to speakers Did you mean audio interface? And what is a jack cable?

What you probably want to do is connect the Nord keyboard to the computer using the usb cable. And you can use some 1/4 inch audio cable going from the output of the Nord keyboard to an audio interface. (And some audio interfaces include midi in/out. But do not use these for now. And connect your audio interface to your mac with a USB cable. You should try to connect the Nord and the Audio interface directly to the mac unless you have a powered hub.

With this setup, your Nord can be used as a midi keyboard to control the software instruments. The keyboard can also send audio to the inputs of the audio interface. You will need to have the track as an audio track for that. Which I believe you set up.

I recommend watching a couple of videos on Youtube for guidance. MusicTechHelpGuy has great videos. Check out Logic Pro #8 for midi recording and #13 for Audio.

I don't understand how "a midi-interface connects to the speakers". MIDI is just a control signal - no audio.