I came across this article in my recent issue of Guitar World and thought it might be of help to some. I've asked a lot of questions about modes during my time on TB and while I'm no expert, I have gained quite a bit of knowledge so I'm trying to return the favor. This is a simple article and makes sense, plus it has some diagrams that conveniently use the bottom four strings of the guitar so they're ready for a four string bass. Hopefully someone can find some use out of this.
Randy Modes Article