My Garmin GMA 240 Audio Panel has a 2.5mm jack on the front panel that can be used for a phone. I want to use a GoPro 9 Black camera (that has a 3.5mm jack) and get headset audio from the GMA 240. Will a simple 2.5mm to 3.5mm cable adapter do the trick? I think using telephone mode for the GMA 240 should provide the audio out. Don't know about signal levels or impedance.