Hi,
I sometimes use a Roland UM ONE midi interface to connect my midi keyboard/sound module to my iPad.
If you look at my photo, numbers 1,2 & 3, you can see I have selected the Midi track channel 1,
I selected Routing #1
I selected No Midi Out #2
In the Midi Out drop down box I selected UM ONE #3
The midi is now output to my midi sound module.
The audio out from this module is routed back to the iPad using an audio interface and into audio track 2 in Cubasis3, tap on Routing and change Mono Input to Stereo Input.
The red button should be showing on the left of the audio track (under the M) and this track must be selected, at the moment this button is white.
Hit record, select Mixer to see recording level.
I apologise if I am telling you something you may already know.
Hope this works for you 
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