Sonic Vibration uses magnetic circuits in conjunction with a powerful speaker system.  These systems are much quieter than mechanical vibration.  It is a softer, more natural motion with the same or greater results. These machines are great for lymphatic drainage, blood circulation, pain reduction, weight loss, detoxification and, on the higher settings, also effective for muscle building and toning.  These machines are just awesome, you will be amazed at how sound  waves can make your body feel, and when you get off the machine, you retain that feeling.  They are addicting, you will want to do more than one session a day just because of how you feel after you're done.  The down side to these machines are that they are a bit more expensive than other machines, but in my opinion they are absolutely worth it.