i have a baritone in my room. i want to learn how to play it, but there is a problem. the keys are kind of jammed. actually they work pretty good, its just that everytime i press the last two its like the air is being blocked. i already tried taking it apart to see what the dilly is but i cant figure out what it is. do you think i can fix it myself, or will i have to get it done somewhere, and will it cost me lots of money?