Tremolo is an expression that repeats or varies a single note, or its volume, in rapid succession to create a wavering, tense feeling. It covers repeated bowing on string instruments, fast picking on guitar, and volume changes produced by an effect.
The basic idea
In performance it can mean re-articulating the same note in quick succession, and as an effect it can mean cycling the volume up and down. Both add movement to a sustained sound.
Using it in performance and programming
Try a tremolo articulation in a string library or a tremolo effect, matching the rate to the tempo. Used just before a climax, it builds tension.
Difference from related terms
Tremolo is a wavering of volume or repetition, while vibrato is mainly a wavering of pitch. The names are similar, but the element that changes is different.
It is a strong effect, so it works best in a chosen spot, such as a sustained note or the moment before a new section.
