I was using the Hip Hop kit “Neptunus” preset and tried to add a hi-hat from the electronic pads to the left of the snare, below the hi-hat. When I select a hi-hat sound and try to use the add knob in edit play style it just adds hi-hat midi data as if I selected the hi-hat on the kit itself.
I’m using EZ Drummer 2 in standalone mode on a Mac Pro, 32 GB RAM, OSX 10.8.5