I am trying to write a letter to my downstairs neighbor. They don't like the saxophone playing even though our other neighbor plays flute which they don't seem to mind. None of the other neighbors seem to be bothered by the sax. They are trying to tell me to play only when they are not home, which is only for a few hours per day on a few days of the week. They have also suggested I get a "sax mute." Last time I played (on a Saturday morning around 10am) my neighbor showed up at my door so upset he was shaking. I really don't want to cause a problem with anyone, so what is the the right thing to do? I have already offered to play during certain hours but that doesn't seem to be the solution for them. How can I work this out?