I have a Blueberry Burst JP15. It has both a mono and stereo output jacks. I tried plugging my new Line 6 G10 wireless into the mono jack today and couldn't get any signal. It works in the stereo jack. This seems strange. The mono jack works fine with a cable. The G10 works fine in all my other guitars that just have a mono jack. Anyone have an idea on why I can't get the G10 to work in the mono jack of the JP15?