Hey @Juanjuan, welcome to Elektronauts. Fellow Digitakt and Model12 user here 
Can you describe what kind of setup you’re trying to achieve? That’s always helpful, since there are a lot of possibilities with these kinds of things and we want to narrow it down to what you want to do.
For instance, if you’re trying to sync your Digitakt to a DAW on your computer, the Model12 MIDI output would be useful for connecting MIDI from your computer to the Digitakt. But if you’re just sending audio into the Model12 and into your computer, with no need for sync, then there’s no need to make a MIDI connection.
In my case, I don’t sync my Elektron stuff with my DAW, so I never use the MIDI connections on the Model12. I usually just connect the Digitakt L/R outputs to channels 7/8 on the Model12, so you have a stereo channel strip to play with. Then you can shape the sound with Model12’s EQ, effects, and compressor. There’s lots more you can do, but that would be the most straightforward setup. Enjoy!
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