Sounds like the velocity is modulating not just volume but filter cutoff too. And either chorus or unison is being used to get that 'big but light' sound. The metallic edge could be added distortion.

Layer a sub-bass b-line with one that has some mid range detail. Then compress, EQ, distort etc. until you like the result.

Also, try running a send to an EQ and a delay in a chain. EQ out the bottom end, make the delay stereo. This'll pad out the stereo image and add to the groove without adding mudge to the bottom end. Give the saound a hard attack to make this work.

T*