MIDI Hell

[Juho L]

Gaah! Trouble ahead. Equipment is this:

Nord Modular - MIDI IO for seuqencer & MIDI IO for editor
Yamaha A4000 - MIDI IO for sequencer and editor
Roland A-33 - 2x MIDI out, 1x MIDI in and thru
Midisport 2x2 - 2x MIDI IO

Now the problem is that what's the best solution for this setup? It seems that it's not possible to use the A-33 to control the modules that both Modular and A4000 would have dedicated MIDI out from the keyboard because I also need a sequencer (doh). So it seems that there's a need for much bigger MIDI box. I can't connect the Modular and A4000 in series because the A4000 is edited on a computer and funny things might happen when the Modular starts to read the SysEx meant for the A4000. So is there any ideas how I could avoid getting a new MIDI box?