The Alcorn McBride TourTraXX is a 16 channel MP3 audio player designed for installation in vehicles.  The TourTraXX can use its GPS location to trigger any number of commands such as Play, Stop, Set Volume, Write to an External LCD Display, and more.  These commands are entered into a GPS playlist using the GPS Builder software available as a free download from our support software website. more information : www.alcorn.com