Ok. I was in the middle of cleaning and running my Pfaff 230. For anyone that has had a question about how well these Pfaff's run and how quiet they are, I shot a 15 second video of mine running with all of the covers off. So it is as noisy as it can get. Keep in mind that the microphone is INCHES away and there is no background noise to speak of.
http://www.youtube.com/watch?v=XgiIMD1me3E&feature=youtu.be