This goes for KK and Maschine Library.
It’s really annoying to have sounds clutter the library and the only way to remove them is to delete the NKS files.
And if, for example, when they are part of the plugin container (as is the case with Korg Gadget Plugins), all you can do is remove the plugin completely (and lose the ability to export Gadget projects to Live sets with the plugins loading).
It’s really no biggie to let users toggle individual sets on and off, why is that feature not there yet?
