Melvin Haze

Hey there, I've encountered a problem today, when I wanted to use a second instance of Drum Pro. I'm pretty new to this, so I really don't know what went wrong. The second instance seems to use the data I've entered into the step sequencer and plays this one snare, but I can't control volume and eg. reverb in the second plugins interface. If I turn the knobs in the first instance's interface, also the second's midi is affected. Thanks in advance and best wishes, mhaze