Basses are usual d'n'b ones but they can prove useful to dubstep, subbasses are just subbasses. The breaks are taken straight off my d'n'b folder. I haven't tried those ones yet for dubstep but I'm sure you can do 1 or 2 things out of them.
Dude, you got some deep heavy bass. Love 'Eye of the demon' & 'Lovesick'. Sounds a bit like the DMZ guys.
Do you use any hardware or it's all vst gear?
Didn't try Mad Tracker so far. To be honest, I think any tracker is just a sub-version of Buzz because of those 100s of machines people keep coding for it. Plus, I've been told it has one of the best vst support around. For people who are already into trackers, it's very few work to learn about Buzz...