no disrespect to and-o,but imo the best music of all time in any genre has been created by people that have no technical understanding of music theory at all..which played a big part in them creating ground breaking works--they weren't working within a box..and when you get too wrapped up in the math and technicalities of music-it can really take away from your creativity
When it comes to basslines,again-it really does come down to what sounds good to you-that is if you have real knowledge on hip hop/beat making..and i know you're someone who knows what sounds good...other than that theres mad approaches to take as far as playing your basslines-some of the best producers keep them simple,some make them complicated..some play mainly on the downbeat,some place their bass stabs in more random,non-traditinal places in the beat structure.Again-when it comes to this,i gotta go back to kev brown,lol-if it weren't for his basslines,a lot of his beats would be mad boring-but he almost always plays a dope melody with his bass,which often times creates more of the beats melody than the samples he's using,and a lot of times have nothing in common with the melody of the sample he's using-they're kind of a counter-melody. and of course his main influence on the basslines was pete rock,so he's definitely someone to study-he's done much more than just filtered basslines.
As far as getting them in tune-just scale a mid range note out,with a bunch of higher and lower ones-and find the one that most matches the first downbeat of your track...that's how i do it,(& all i got is 8 levels on the st,or 12 on the 202)and i just go from there-once you find that main root note just build from there,and in a few minutes you'll have a good handful of pads that all match any part of the beat-then it's up to you how you wanna play it....& as you know,even just a one or two note bassline can be dope-a good example of this is the alchemist produced prodigy joint i just posted on the mobb thread...just one note-that's it,but it's the bassline on that track that takes it to another level.
But ya know...at this point i'm willing to bet you'll be good with just going with what sounds right. I got some high expectations for all these beats you got hidden away btw,lol

-trust me,i got my best shit stashed too.Espescially beats that I've gone all out on with the basslines... I'm getting closer and closer to having all this stuff ready....anyway,hope this doesn't sound like just a bunch of hot air and at least helps somebody,if not you. as yall can tell-I really love talking about this shit,lol....only thing i'm truly passionate about & takes my mind off the madness.