I remember when I bought the FiiO X7, I raised a suggestion on their forum. “Could you make the screen stay on and support phone or car Bluetooth control without sound output? I always run AUX out to the car stereo.” FiiO’s official reply said they understood my need and knew that controlling a car stereo through AUX input was a real problem, and they’d find a way to solve it. So direct car control really did turn out to be difficult. FiiO instead released this little thing, a Bluetooth remote…