1 - Yes, under Settings > Sound & Display > Audible Selection, deslect it2 - No idea, mine is silent.3 - No, The only way to see youtube videos on the current firmwares (0809/0818) is to use the youtube apk. This has been covered in multiple threads. A few minutes research on here would have answered that for you. Not getting at you personally but at least half of the questions that people post have been answered multiple times.