Hi TAN,
Thanks for your message.
Cubasis supports compatible MIDI and audio hardware devices to connect and run external gear within the app (such as Steinberg’s UR series and lots of other 3rd party iOS compatible hardware devices).
Since we’re not equipped with Roland’s duo capture device I’m not able to give it a test drive, but it seems some users discussed about the device in our forum some time ago: Creativity First | Steinberg
To learn more about Cubasis MIDI routing options, please have a look at the Inspector section in the Cubasis in-app help.
The following tutorials should be helpful to guide you how to route audio signals in Cubasis correctly:
Hope that helps.
Best,
Lars