Soundpaint now supports keyswitching between different parts allowing you to access multiple parts and articulations from any library within the same instance.
To set up Keyswitching, first open a blank instance of Soundpaint, and select "Parts" in the top left.
Once you are in the Parts menu, you can then load the various parts and articulations you want to keyswitch between into any of Soundpaints 8 part Slots.
When all of your desired parts are loaded, go into either Rack A or Rack B inside of Soundpaint, and select the Keyswitch Rack.
Once the Keyswitch Rack is Loaded, it will automatically populate with the parts currently present within Soundpaint, and you can modify what keys are used to switch between the articulations using the options on the right side of the rack.