According to Douyin query, the location of Douyin sound effect settings is as follows:

1. Open Douyin APP and enter the main page.

2. Click the "I" option at the bottom.

3. In the "Me" page, click the three dots icon in the upper right corner.

4. In the pop-up menu, select the "Settings" option.

5. In the "Settings" page, scroll down to find the "Audio" option and click it. Now, you have entered the sound setting options of Douyin. Here, you can choose your favorite music, adjust sound effects and background music, etc.