Tangomo, I do what you're trying to do all the time with many synth modules as you can see from my "sig". Please review Rharv's comment again, you are dealing with two signal paths. One is MIDI, the other audio. You will either need two units (one audio and 1 MIDI) to handle this or a combination unit like the Focusrite units that handle both MIDI and audio.

You connect the MIDI out of the Kurz unit to the MIDI in of the audio/MIDI interface and the MIDI in of the Kurz to the MIDI out of the interface. The interface then connects to your computer via USB. The audio outs of the Kurz units connects to the audio ins of the interface. Depending on if you want to run stereo out from the Kurz and also depending on how many other audio devices you hook up to your system will dictate how many inputs you need on the audio interface.

In my case, I have to use two separate units, audio and MIDI, only because I am using multiple synth units all at the same time.

Win11, Intel i7 7700K 4.2Ghz, 32Gb RAM, 2x1Tb HD, 500Gb NVMe, BIAB/RB 2025, MOTU 828MK3 audio, MOTU Midi Express, Yamaha Montage 7, DX7II, TX802, Motif XS Rack, Roland Fantom XR Rack, Oberheim Matrix 1000, VoiceLive3 Extreme, Kontakt 6, SampleTank 4.3