Tremolo. The Smiths, "How Soon is Now?", opening guitar riff has a tremolo effect by guitarist Johnny Marr, with a second voice playing slide guitar. Tremolo is rapid change in volume to give a sensation of motion, and is rapidly varying amplitude modulation effect. "Songs that Changed Music: The Smiths - How Soon Is Now".
Vibrato.
Chris Isaak, "Wicked Games",
an example of vibrato effort using a guitar whammy bar.
Vibrato is a slowly varying frequency modulation effect.
Delay.
Stella, Reverb and Delay Explained,
start at 1:11 mark.
Delay controls when echoes arrive, whereas reverb consists of delays that are
not controlled.
