I have a Yamaha AW4416 multitrack recorder. I have just mixed a song, but every time I play back the recording, the red STEREO master slider automatically fades down to -00, making the entire mix inaudible. I've gone through the manual, searching the "Automix" and "Scene" sections, but there is no explanation for how to defeat this automatic down-sliding. Could you please help? Thank you in advance for your reply.