Intruder then this. Thanks Phil, Hugh, Steve, and Peter.

...on & off for many years.
I programmed everything (drums, bass, keys) and we sang 3 part harmonies.
The drummer would do cymbal flourishes, guitar would do feedback swells in & out, bass would just drone a low note by pounding on the instrument.
After the second verse, everything would come in live, typically with a pyro flash.
There's a really good video around here somewhere showing us opening the show at a festival with it.