You can record midi tracks using your USB cable with many different audio programs... and with a good drum VST you may prefer the results to the built-in sounds of the DM6. But this adds a layer or two of technical complexity and a steep learning curve (and usually additional cost) to the project.
Alesis DM10 Module, S&S Industries Stinger XL snare & Stinger P1 toms, Alesis DMPad cymbals, Roland PD-8 & KD-7, Gibraltar rack/hardware, Tama hardware, Hart Maxxum/Magnum Mesh Heads, Roland KC-350 amp, ATH-M50s headphones