Link to the website: http://www.m-audio.com/products/en_us/TorqXponent-main.html
How to start up xPonent in Listening Mode for LED support:
1. Hold down the keys “2” and “key-lock” on the left deck of the xPponent
2. Switch on the xPonent (while holding both keys)
3. Wait until the xPonent is completely started up (red LEDS on both decks are fully lit) then release the keys
4. Now LEDs work!
HowTo: Xponent setup for LEDs http://www.native-instruments.com/forum/showthread.php?t=71882