Blending old and new midi clips

So I've come home to SONAR X3 to try doing a project in it to see if I can rekindle an old flame.  I've got the DnD properties set to blend old and new material.  What I expect to happen is that if I have a shaker groove present in my EZdrummer midi track and I DnD a bongo groove into the same track or another layer/take track, I would get a track that contains a shaker and a bongo.
 
What I got was a bongo for two bars and no shaker and then the shaker started at the end of the bongo groove.  I'm betting that I've forgotten something that I need to check off.  Or maybe not.
 
So, as a workaround, I DnD the bongo groove into the empty space in the clips pane and SONAR created a new midi track which I set to output to EZdrummer.  That works as I would expect and now I have bongos and shaker.  Cool.  However, the bongo player is beating his drums a little too hard so I opened up the Inspector to access the Velocity control for that track.  I reduced the Velocity value for the bongo track and expected a velocity offset to be sent to EZdrummer for the midi notes on that track.  Nothing happened.  I dropped a Midi FX in the FX bin for the track and was able to get the velocity values down to get my desired outcome.  But, why did I have to do that?