I’ve just tried this plugin, the VST2 version. It has some issues:
The latest build was in 2018.
After trying to run it again, it crashed (I’ve just sent the crash report to GP devs).
I’ve also just found this info on the issues page:
Doesn’t work at all with Cubase 10
Looks like she doesn’t work at all with Cubase, is that what everyone else is seeing? Blank error box when she loads, can’t assign samples to key regions, more errors from Cubase.
I suggest that you contact the plugin developer as this plugin has problems.