The option that does not lengthen a note is dynamics.
Here’s a brief explanation of the other options:
- Fermata: A symbol that indicates a note should be held longer than its usual duration.
- Dot: A symbol placed after a note that increases its duration by half of its original value.
- Tie: A curved line connecting two notes of the same pitch, indicating that they should be played as a single note whose duration is the sum of the two.
Dynamics, on the other hand, refer to the volume of the music (such as loud or soft) but do not affect the length of the note.