Open the Fruity Wrapper the plugin is in (It's usually always called the same as the program name, in this case you'd see "Orchestral") and look at the top right corner where it says "PORT".
Change the port from --- to 0.
Then, Channels -> Add one -> MIDI out.
Put the MIDI port to 0 as well, and set the CHANNEL to whatever instrument you want to use from the Edirol plugin. 4 would be the bassoon when it boots, for example.
Make new MIDI channels as you go for the rest of the instruments.
I'm not quite sure how you let it save the settings. Hasn't been successful here yet. But it shouldn't be too difficult to switch it back after you reload the project.
PS: If you hear a MIDI piano when the instrument is playing, go to OPTIONS and uncheck the ENABLE MIDI OUTPUT from the list. That should fix it.