There are four solutions scattered around on the CTX forum for the headphone compatibility problem. One is to add a jumper to the headphones to make the stereo jack into a mono jack. The easiest for me was to add a wire wrap around the orange and black wires inside of the headphone adaptor, you will need a T-10 screwdriver. Third is at the top of the CTX forum and that is making a flexible stereo to mono adaptor cord and forth is to buy a stereo to mono adaptor at Radio Shack but many of us don't like the adaptor sticking out the back of the CTX. I can get together with your CTX guys most anytime and help you with it.
Headphone fix link http://www.findmall.com/read.php?22,1729740