So I ended up with two two-worlds-set ups instead:
1) iPad air with a Oxygen 49 controller
2) My JD-Xi with my EMU MP7 as main station and the iPad as recorder only (Auria).
However, all this testing made we wonder where we are today with regard to integration of hardware and software. What are your best-of-two-worlds-set-ups? What kind of audio and midi syncing works for you. Do you use DAWs and softsynths only with controllers? Your PC/MAC/iPad as recorder and/or sequencers and/or editors for your hardware only? Or anything else in between? If you have the time, you are very welcome to write a little about your own personal best-of-two-worlds set up, including problems and workarounds, if any.
Thanks in advance