Hello, I'm trying to use Reason from Cubase and am having some problems. I can use Reason just fine by itself, but when I try to launch it from Cubase I receive the following error:

"Midi input problem. One or several of the MIDI inputs could not be opened. They might be in use by another application. Open the Preferences dialog and check your MIDI settings".

Then I get the error: "Reason couldn't set up the control surfaces properly. For details, please open the Preferences dialog, go to the Control Surface page and click the red X symbol(s) in the surface list".

When I do this, I get "Reason can't open the MIDI port selected for the control surface. Please make sure that the drivers for the MIDI interface or device are properly installed, and check that no other program uses the MIDI port".

It looks like it is saying the MIDI port is in use (presumably by Cubase), but I don't know how to resolve the problem.

I'm using:

Lexicon Omega audio interface with latest drivers
Cubase SX3
Reason 3.0
Roland XP-10 keyboard

Any help would be greatly appreciated! Thanks!