Hey @PeterGill1, I’ve moved your post to a new thread just for the sake of organization.
To answer your question, using a drag knife would be very quiet, no louder than your TV or radio. You would just have the noise of the steppers and that’s not much noise at all.
There is a lot of discussion on the below list post along with some videos of people using drag knifes.
Unless you decide to use a shop vac for a vacuum table I doubt you neighbors would really notice you were using your machine.