Hi Steve,
I’ve already reported to your previous message, so I was assuming you wanted to have additional feedback from the community.
Here is a tutorial of our good friend John Walden (Music App Blog), how to work with MIDI files in Cubasis:
http://musicappblog.com/cubasis-workshop-1/
Given a decent connection between the iPad and your external keyboard, it is possible to route MIDI tracks individually to be played back by your keyboard.
For more details, please have a look at the Inspector/Routing chapter of the Cubasis in-app help. Please note that the external keyboard in use has to be set appropriate (e.g. Local Off etc.) in order to properly play back the MIDI events coming from Cubasis.
As mentioned earlier, we’re not equipped with a Juno to test it, or give you further instructions how to setup the keyboard.
However we’re at hand to provide Roland with a Cubasis promo code, to allow them further checks.
Hope this helps!
Best,
Lars