I've been working on perfecting my setup, and thought it would be a good idea to seek your advice as well.
When I first started using my Motif Rack XS, I had it the MIDI/USB/mLan mode option set to MIDI because this allowed me to successfully interface my various devices (Keyboard Controller, iPad I/F, etc.). Later I discovered Studio Manager and the XS Editor which I am now completely hooked on. Of course, to do this, I had to switch to USB mode and this introduced some new challenges which I still have yet to solve.
I understand that when the XS Rack is set to USB mode, the MIDI in/Out ports are disabled. However, I also want to connect my iPad and use my favorite gigging app (called BandHelper from Arlo Media) to send and receive various MIDI messages. So far, I've only been able to get this work when I have the XS Rack set to MIDI mode. I have two devices which I own: Presonus AudioBox iTwo and Griffin Studio Connect. Both devices have standard 5-pin DIN MIDI In/Out connections. The Presonus connects to the laptop via USB, but this does not carry any MIDI data, it is only to power the unit. The Griffin has no USB, so I tend to gravitate towards the Presonus, especially since it has a lot more I/O options.
I have an Arturia KeyLab 88 MIDI controller also connected to the Windows 10 laptop via USB, and I am able to successfully send control commands to the XS Editor from the Arturia controls. I also have a MOTU Fastlane USB port which connects to the same laptop via USB and has 2 in/2 out MIDI ports. I thought for sure if I used the MOTU to act as the MIDI bridge from the Presonus or Griffin, that MIDI messages would get through to the XS Rack, but at the moment, I have not been successful on this front.
If you have any suggestions to help me get my iPad talking with the Motif, including trying other IOS interface devices, I'm all ears!
I apologize if this is somewhat confusing, and will do my best to clarify if you have questions.