As an experiment I recorded audio from my MPC 2000XL at various amounts of 16th swing. I was curious to see if I my homemade groove templates would differ from the stock files available in the core library.
In the end there was very little difference, but I decided to offer them for download anyway.
I did notice a couple interesting things along the way:
Both my groove files and Ableton capture the less precise timing of the MPC, although mine varied more than the stock Ableton files. You can view any of the results by dragging the groove file onto a midi track. If you zoom into the midi notes on both my files and the stock files you can see that all midi notes are off the grid just a little bit.