Hey everyone. About a month or so ago I got my first euphonium (I've been using school horns) to last me through college and hopefully much further in life. I went to Dillon music in Woodbridge NJ. I ended up getting a used, but very well taken care of, Sterling Virtuoso with a tuning trigger. I love this horn. It has an amazing sound, smooth valves, and looks very nice. On top of all of that it fits my playing perfectly. However over the past couple of weeks I have been having problems with it. First of all the fourth valve started clacking. Not the way it does with a loose valve cap, but more like if the padding had suddenly become very thing and rock hard, neither of which are true, I checked. This shouldn't make a difference, but the bottom valve cap on the fourth valve is a heavy cap. So that all happened and I was frustrated but could deal with it for the time being. However, this week another annoyance popped up as I started getting an annoying buzzing sound, as if there was a loose brace or loose solder, whenever I played notes with valves one and two down below the D above the staff. I checked all of the braces and everything by having my band instructor check them while I was playing and we couldn't find the problem. So if anyone has any ways to help fix these or at least things to check, it would be greatly appreciated. I would much rather not have to send it somewhere to get fixed with college auditions coming up soon.