- Windows: %LOCALAPPDATA%\Bitwig Studio\library\samples
- Mac: ~/Library/Application Support/Bitwig/Bitwig Studio/library/samples (use Finder's Go to Folder (Shift+Command+G) and paste the path in there, it's a hidden folder by default)
- Linux: ~/.BitwigStudio/library/samples
The actual filters themselves are a bit wordy due to BWS's filtering being a bit broad and inaccurate currently, so I've added !not logic to some of them to keep up the accuracy. You can of course edit/extend them as you need.
Just as a brief explanation of how I've set them up: Any sub-categories, for example Hi-Hats, won't be found (or at least hopefully not many) in a parent category such as Percussions. This is to reduce a bit of overlap and clutter. If the collection's name is a bit mysterious, just right-click Edit them to see what they're supposed to contain.
If Bitwig improves their filtering, I'll update the filters to something more elegant and post them here when the time comes. It'd also be great if Bitwig included some smart collections by default as they do help to vastly improve the browsing of thousands of samples.
The smart collections:

