The thing I love about Dilla is that he will confuse you with his bass-lines and kick drums that sometimes you can’t tell which is which. Nonetheless, this beat is extraordinary.
Listen to Jay Dee 39 of off Vol 2: The Lost Scrolls. Same baseline as this track. Found the sample: Bill Evans - Maxine. Piano is slowed down. Only found this out because of the matching basslines. Crazy!