[Al Skierkiewicz]

All of the above devices use a DC-DC converter that can make some noise. It is usually low level and very high in frequency so it isn't noticed over the rest of the robot noise. The convertors do make considerable noise when shorted or trying to do something they are not intended to do. If the Crio is making the noise, I would suspect it of having a problem. There is no speaker in the Crio. If the analog board is making the noise, I would check for miswired power to the board.