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Step 3: Set Osc 1's Cent to 30, and Osc 2's to -30. This starts to give the sound the thickness and movement that's common in dubstep basslines. As well as the low-pitched oscillators, it's good to have some slightly higher content to fill out the bass-end a bit more. Turn on Oscillators 3 and 4 and set Oct on both to -1.