Thanks that solved the issue and corrected a misconception I had relating the EM management by playback templates in Dorico.
I indeed did not start with a new project. I took an existing full functioning project using the SY libraries in VEPro with my own EMs, switched to the Silence template and then to your wizard generated template but that apparently does not replace already existing EMs. If I start with a new project with the Silence template and then switch to the new wizard generated on it work correctly.
Also a misconception regarding the second screenshot. I always put the Vel.-XF button on On for instruments with CC2 as secondary control but that is not necessary to generate the CC2 lane in Dorico.
Many thanks. One keeps learning.