Hi Seep,

Well, you don't necessarily need to connect the e6400's MIDI output to an input on your interface unless you need to do sysex dumps or anything like that.

The only other thing that I would worry about is are those 3 MIDI outputs separate? You need at least 2 separate MIDI outputs if you want to access all of the MIDI channels from both your e6400 and your K11. What I mean by separate is that MIDI output 2 and 3 don't echo the information coming out of MIDI input 1.

If you have separate MIDI outputs and don't need the MIDI info coming out of the E5000, then you should be fine with what you have for now. You can always upgrade as your needs grow in the future.

HTH
Fernando