IMO at the beginning of the tour it was 100% live and during the tour it changed.
Sometimes it's live.
Sometimes he sings live 1 verse out of 2.
Sometimes it's the tape.
It's what my ears percieved! but I'm maybe wrong!
I guess there are different reasons for that, including the difficulty to sing it and Meat's particular condition at some shows...
But who cares? that's so cool on stage!
Patricia
... love Do It! live or not!