I believe you have to use a sequencer program to connect the usb device with the Scope environment. I don't think Scope alone lets you identify the E-mu as a device on the routing table / patchboard.
In Cubase you may select the Xboard as your MIDI input, and on the same sequencer track you may select Creamware MIDI1 as the output device. This way the MIDI data you generate on your E-mu is directed to your Creamware synth of choice.
Then it is easy to assign buttons of the E-mu to various controller settings on your synth. Just right click on the parameter you wish to tweak and turn a button on your E-mu. The Creamware synth identifies which CC channel you used.