I've contacted line6 and the response was: "the GX does not support mic usage.", Though, I didn't expect from them to give a reasonable response.
The microphone, cables and jack converters work with Phantom Power supply if I directly plug in to the laptop's microphone input. Quality is good but there's static/hissing noise.
Can you tell me your cable setup or maybe sound properties? Do you plug in any cable to the GX's headphone output? I use laptop and it only recognizes it's microphone.
Sorry for rushing with my questions. I really need to fix this issue otherwise I'll have to buy an interface with 48V which will cost me about 200$.