Hypnotic trance bass question for newbie!!!!!!

[TeenGirlLust]

Hi.....not sure if anyone can answer this over the internet for me......but here goes. I work with all hardware : Virus B , Nord 2x , mpc 1000 ......I can not figure out how to write hypnotic /repetitive trance bass lines for the life of me (Paul Van Dyk and Aura use them all the time).....I am not sure maybe they are all arpeggio's.....I don't know.....can any one help.......I know there must be a trick for this cause I hear a lot of different artists do it all the time............thanks......Matt