I tried plugging my earbuds into the audio output jack the other day for the first time. The plug fit the jack, but no audio! Can someone tell me why? (Nope, the audio wasn't muted!) Added Later: Sorry, I finally decided to look in the manual---and noted that it is a mike jack and not an output. So the question is---if I want higher quality audio than the speakers can provide, how do I do it?