Question

Why did Annette Brougham use foot on the pedal of her piano?

Answer 1

This question is a part of P G Wodehouse who wrote "The Man upstairs" and here there were detailed descriptions about how Annette Brougham used her foot on the pedal of her piano.

The movement was somewhat referred to as slapping on the door by using her foot.

This was pretty important for the story.

So there were three demarcated stages explained in this story in which the slapping or  banging on the door with feet was a remarkable one.