It wasn't too loud, but I was taking tiny little cuts. Bigger cuts might make more noise.
I've got the re-start enabled, but my programs are so long that line numbers overflow and re-start, sometimes three or four times. I've given up on them. To clear the error, I have to hit RESET, and that looses my place in the program. What I wound up doing was shooting a photo of the program screen, then opening the program in a text editor, and hand editing out almost everything before where the error occurred.
It worked so well, that now I have to do another one. I need better foam, and I'm going to cut it into smaller pieces I can machine much faster.