Here is a great tutorial about "how to create a bassline on a MPC" by JFilth. His method for making a bassline on a MPC can be applied on any drum maschine that has 16 pads. So Maschine/MPD/Trigger Finger user take notice. 

Without any music theory you will understand it. He has 4 different tutorials on bassline where he discusses different scales you can use. 

 

For finding the rootnote of your key of your sample so you can play the bass. Check out this article "How to find the root note/bass note of your sample" 

Enjoy, peace !!!!!!

 

check out his blog for more interesting articles/tutorials etc

 

www.howtomakeverysickbeats.com