Picked up a 303 and so had to try these two famous riffs together. It's not 100% perfect, but pretty close. Once I've nailed it exactly I'll possibly make a video tutorial on how to do those sounds. Drums - Sequential Drumtraks sequenced by the BeatStep Pro via its midi-in. Squelchy sequence - Roland TB-303 running into an Ibanez Tubescreamer. Riff - Korg MS20 mark I (with the type-35 filter) run back through its own external signal processor and with the keyboard voltage tracking the filter cut offs. The distortion is entirely from the synth, there's no extra processing. Also put in the bass quarter notes after the fact on a Fender Jazz bass.