How to add small audio to a big background music?
You can add the small audio-clip to big background music by using some software like Audacity, Adobe audition, FL studio, Nuendo, etc. First, you have to import the main BGM into the track section of any respected software. Then, you have to import the Audio clip which you want to add on the next track line. After that, you have to choose the time where you want to add that clip. Afterward, use the tool to cut the main track section from the selected time and insert your audio-clip. Then you have to add some effects and other tools to polish the audio to match with the mainstream audio.