Icmemusic, welcome to the forum.
That's quite a jump from Cake Pro9 to Sonar X3 . . . obviously many things have changed, and there are new ways of doing some things.
You might be able to map some keyboard shortcuts regarding Event View to help speed up editing.
What I find best for adjusting midi drum track levels is the PRV view. Once there is a midi drum map set up (this may take some effort depending what drum device you have) you can select individual drum pieces and adjust velocities for a whole track very quickly.
Also, "page up and page down" in Event View still works fine on my system.
Also, new in the X series is the Event Inspector (a module on the control bar) . . . you should check that out to speed edit your tracks.