My HO layout uses only Bachmann trains & tracks. I run both DC and DCC using Bachmann's DC Controller & the EZ Command (DCC) system. What else is needed to program CVs. I know that the EZ Command does not support changing CVs, only the specific addresses.
Obviously you need a better system.
You can change CV's with the Bachmann Dynamis. There are other systems but I cannot mention them here.
You must be very new to DCC. There is a learning curve.
Below is a link from a Google search with many links about CV's. Probably much more than you really need. Pick an choose the ones you want to keep in Favorites. You will need them.
http://tinyurl.com/cfprgla
Rich