This is just the name of the application, because according to the official information, you have the possibility to assign multiple channels (up to 16). This means you have the possibility to load Superior Drummer 2.0 & EZdrummer. The screenshot of the application shows that multiple plug-ins are loaded in the same time. You might need to define the VST plug-ins in the Settings menu before you can actually use them. For more information, access the official website of the software.