Just having a brain and a pad > plug into mixer/PA and off you go?
Purely hypothetical, but I've always loved the sub drops Adler throws in during the breakdowns in LoG songs live, and I know he uses a TD-7 module with a single pad to do it - but HOW do you do it? Use preset ones, or upload custom ones from a laptop to the brain? IE, you could upload ones at different "notes" (I think 'E' is 50Hz, and 'D' is 44-45hz, no?), customised for sustain and tail off
Also, what sort of speakers would you run these through? Bass cabs? Or go the whole hog and build a pair of dual reflex box with a pair of 18" car audio subs and a reference grade mono-block to juice them