My Akai MK1000 has already midi merge possibilities. Handy as a pianist as I am that uses a Roland RD800 and also Nord Stage.
If you are performing live with a roland fantom XR, you will need midi DIN out. An extra keyboard e.g. Novation MK3 37 I put on top of the Kontrol s88 and use the Midi IN for the purpose as an extra midi channel for a synbass or lead synth it doesn't seem to work!
Will this be possible in the future via an update?
greetz
Marc