Lately, I've been listening to drone based music, à la Stars of the Lid, and would like to explore the how to:s of making similar soundscapes with bass guitar in hand. So now I'm wondering: how does one create layered drones live, in real time (without playing through a computer)? I know that it can be done with the right types of effects, but which ones? What would I need as a bare minimum? Those of you that have them, please share your drone recipes!