I don't want to bother with what seems like a tiny dust sound in very end position of volume pot. I checked today and it not actually like a dust sound. A tiny scratch sound at very end of max volume position makes me think it's just the electrical sound of the pot contact rubbing over the unused end of dial. Rather than dust it may be extra substance that make the dial move smooth. . Has no effect on sound though and only noticable when moved with no music or I would blow up my headphones lol.