A lesson sounds fine over its title card. Then the narrator starts speaking and the due date disappears under the music. Turning up the entire video makes both tracks louder. The more useful question is which sound should carry the message at that moment.
Compare one spoken passage twice
Listen to the example with sound on. Both halves use the same sentence and the same short music file. In the second half only the music level is lower. This is a listening exercise made for the article, not a recording of an editor slider.
Spoken line in both passes: “Name the account owner and the due date.” The second pass lowers the background music while leaving the voice at the same level.
Could you repeat “account owner and the due date” after each pass? If the answer changes, the mix affected the instruction. The right balance depends on the voice, the music arrangement and the listening environment, so copying a single volume number from another video is a poor shortcut.
Make the smallest change that fixes the conflict
First play the voice without music. If the sentence is already unclear, fix the wording, recording or narration. If it becomes unclear only when the soundtrack starts, lower the bed, move a musical accent away from the sentence, or choose a simpler instrumental passage. For a dense procedure, letting a key instruction play without music is a reasonable choice.
In Studio, attach or select an approved soundtrack. The audio controls guide distinguishes soundtrack selection from voiceover. The captured source preview below shows where to check which MP3 the project received.
Test the mix as a learner hears it
Play the quietest passage and a scene transition at the same listening volume. Try ordinary speakers as well as headphones. Ask a colleague to repeat the action without looking at the subtitles. If they miss a term, change that passage rather than globally raising the voice until the opening becomes uncomfortable.
Use captions when viewers need the words on screen or are watching muted. Then export the video and play the actual file. A good preview is helpful; the delivered audio is what the learner hears.
If the intended song is missing altogether, check the source file first. The MP3 upload walkthrough shows where to find an attached soundtrack before comparing the balance.
