Hi,
Could you describe your routing? ID the output of your Korg Minilogue routed to the Input of your Audio Device? If yes, you can add an Audio track in Cubase. Set the relevant Input (where does the signal comes from Minilogue), set the Output (Main), and enable Monitor on the track (orange speaker). All other tracks have Monitor disabled.
Now, you can hear the signal from Minilogue thru Cubase, which is routed to the same output, as other tracks in Cubase.