Cubase 5: patch names on midi tracks

Hello, I downloaded a clavinova cvp509 instrument definition .txt file for use with Cubase 5. When I open a new project, I noticed that on Midi channels 1-4, I have access to all the voice patches, and on Midi channels 5-16, only the drum patches are available for selection.
I don’t need so many drum tracks. How do I get the voice patches to show up on channels 5-16?

I have a similar question but I’d also like to know where you got the instrument definition .txt file. I have a clavinova cvp609 and i’m trying to set it up as you did?