Synths yes, percussion no :(
First off, i like! It sounds dirty, aggressive and heavy.
I am not that experianced with drumstep but i have dabbled with it. I think the trick is to make your percussion as crazy as the speed with tom drums rolling down, beats skipping and double hits every where. Also youtube somthing called "ghost notes" for drum and bass its bassicly essential for making a pro DnB loop and i am sure it also plays a big part in dubstep and drumstep.
Feel free to pm if you have any questions and i will help if i can.
5/5
9/10
-FridayFox
(Check out my new house track at ... http://tinyurl.com/84w9ayo ...)