Hi Bill.
Hope this helps! it is a sound field system that they use, if this isn't what you need i would think they can offer assistance. I'm at work currently and have only a second so I wasn't able to reasearch it.
www.lightspeed-tek.com
800 732-8999
Let me know how you make out!

Donna


Donna
CG to Mom, dx 4/25/07 with tongue cancer,T3N0,tx began 7/6/07, 31 tx's of IMRT, 8 cycles of Erbitux. Brachytherapy, surgery, left neck dissection and temp trach placed all on 9/17/07, trach removed 10/17/07. ORN of jaw, late effect of radiation symptoms. **lost my beautiful mother on 5/5/11.