MTS stands for Multi Track Sound. Broadcasters use MTS to provide additional, secondary audio tracks. These tracks include:

• SAP (Secondary Audio Program). For example: French, Spanish, etc.
• Weather and traffic reports
• Descriptions of the action for the visually impaired
• Local radio broadcasts that may have nothing to do with what is on TV.  

Some channels always have the multi track stream turned on in their broadcast, but do not always have an audio track playing. Other channels do not have any multi track options. Consequently, if you turn MTS on, you may hear regular audio on some channels, no audio on others, Spanish (as an example), weather, or action descriptions, etc. on other channels. 

How to turn MTS Off

To turn the MTS off, press [MTS] on the TV remote one or more times until the screen displays "Stereo"

Important: If you press [MTS] and you see a "Not Available in Current Mode" message on the screen, you have MTS turned on in your cable or satellite box. The TV has nothing to with this problem, and you will have to contact your cable/ satellite provider to turn MTS off in your cable or satellite box.