Some days ago, I buy udoo quad and install last version of android for udoo quad. I plugged my micro and headphones to board. Change the audio output to "Board". My problem is that I hear in the headphones sound and voice from microphone loopback without any programms or other, i hear myself after boot. I tried standart "Sound recorder" to record the sounds. The program recording my voice and detect sound, but quality of play is very bad and the rasp is heard. Does someone has this problem or know how to solve it? Thanks for any help.