PBW specifically explained the process of how Donuts was made. Nothing about the 303. That was Madlib's machine, and you can completely tell from the compression and time stretch in his beats at that time, unlike Donuts.

"In one track, looping part of an old Jackson 5 ballad, "All I Do Is Think of You," James suddenly halved the tempo and stretched the loop out to cover the doubled space, while keeping the pitch constant. This kind of "time stretching" wasn't possible on an MPC. He'd done all these beats right on his laptop, via his Pro Tools software, which enabled James to see the waveforms - dice and recombine them, squeeze and stretch them - in ways he'd never before attempted. Created in a burst of energy after James' discharge from Cedars-Sinai in early 2005, Donuts emerged as a complete thought."