Thanks for responding so quickly. I opened a new project, uploaded the SD3 and the Smart Loops Groovy Kit. Assigned each piece in the kit a track. Then I noticed the gain and velocity, in the Track panes were at zero. I then opened the Step Sequencer. I entered some notes and manually adjusted the levels (blue bars in step sequencer).
There was no problem. The sound level varied relative to the velocities I had selected, unlike what was happening in the actual song project. I believe the problem was that I messed around with the gain and velocities on each track and also had somehow disabled the Use Fixed/Default Velocity For Step Recording in the Step Sequencer Options tab.
So I will go back and upload the SD3 again into the project and make sure gain and velocities on track are zero. Also that the Use Fixed/Default Velocity For Step Recording is enabled.
I know there are a lot of great patterns available, but this song was in 3/4 and I couldn't find that many patterns for that time signature.