Hi Dyeone, welcome to onlineDJ!
You mean MIDI sequences / patterns?
You have some nice equipment there, to compose your own basslines quite easily in Cubase, controlling either the RM1X or the A4000
What I suggest to you is to buy a few CDs or vinyls of drum n bass (or whatever style you feel to compose), and listen to them for hours, analyzing how the architecture of the music is, what kind of sounds they use, how the rhythm is built.
Then, turn on your machines, prepare a few good sounds, and start composing in Cubase.. It is not that hard really if you are inspired.
I know i didnt give you "good addresses to get midi patterns" but I hope this helps you anyway. If you have any question regarding your equipment or cubase, you know where to post
Take care and have fun
see you around, thanks for beeing a part of it