https://blog.faceutil.com/2020/07/15/%ea%b3%b0%eb%85%b9%ec%9d%8c%ea%b8%b0-%eb%8c%80%ec%8b%a0-%ec%bb%b4%ed%93%a8%ed%84%b0-%ec%86%8c%eb%a6%ac-%eb%85%b9%ec%9d%8c-%ed%94%84%eb%a1%9c%ea%b7%b8%eb%9e%a8-audacity-%eb%ac%b4%ec%84%a4%ec%b9%98/