In the last 3 years, I have created what we call "samples" for a metal album for a band here in Montreal. The samples are distorted, loud and dark sounds of around 1 minute to fill the silence between the songs and sometimes added over track to create a very disturbing ambiance. Some of these samples are loopable. When they do shows, they put these samples on a foot pedal sampler and they can start/stop them whenever they want.
I have created these sound with Cubase 6, FL Studio, lots of plugins and the most important, recordings of real sound to which I add distortion, slow motion, reverb, layers, etc.. until it reach a good level of madness :)
My friend in that band asked me if I could join them live and create most of the sounds live. I know it's possible but I have no idea what kind of gear I would need to do this. As an example, you can check the band "Neurosis". There is a man using keyboard and lots of other gear to produce dark and disturbing sound live...
Any help pointing me out what kind of gear/software I would need to create live sound like that will help me a lot.