After 7.5 update most of us who playing on NA servers noticed that bug with sound in our houses. I'm not sure about others servers in EU, RU (same bug, confirmed. Fix works) and KR, perhaps they were more lucky. But if you have same bug, you can try my fix.
Update (27 Jule 2020): volumes of piano(+1dB) and violin(+5dB) were adjusted.
Update (30 Jule 2020): guitar was changed.
