You need more MIDI I/O; tricky as it’s DIN MIDI and USB MIDI
I can suggest, point to a direction but this is going way into ‘personal-preferences-territory”
- www.Iconnectivity.com
has MIDI interfaces with DIN and USB connections in one box.
This post reveals this USB-MIDI-USB
http://forum.critterandguitari.com/t/usb-midi-usb-seville-soft-midi-connection-between-two-host/2050?u=keymanpal
Simple yes… but attention to the patches how they behave, what they have implemented…
Hope this give some pointers