This took me a few hours to master, but I think I've got the style of old-school dubstep pretty down. For the bass, I drew inspiration from almate's song, Liquid Emotion. I just took the same formula for the sub bass, added a saw and exciter (and adjusted the LFO) and it resulted in a bass similar to Skream-era dubstep.
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EDIT: Fixed bass melody, hihats right before drop as well.