DJ Mart-Kos
All Star
you can make basslines on any bass vst easily, its all about your ear.
put a low pass filter on your sample so you can only hear the bass, then put the same filter on your bass vst.
then simply play back what you hear.... this works best in headphones so you can really get the notes right. you should be able to tell when its the right note and when its clashing. when youre done put a high pass on the sample to remove the bass and use your own. once youve got the notes you can freak it any way you want.
I used to do this but i stopped doing that cause i was never 100% sure if i had played EXACTLY the right notes when recreating the bassline from the sample.
So i started doing Low-Passing more. Gets the Job done the best.