Delay effects create a copy of the audio signal and play it back after a short period of time. This delayed signal is usually mixed with the original, creating an echo-like effect. There are many types of delays, from those modeled after old tape machines or analog chip-based units, to complex computer-designed systems that allow users to set delay time and volume for each separate repeat. Most delays will have at least these controls:
- Delay Time: to set time between the original sound and the repeats
- Feedback: to set the number of repeats
- Mix/Level: to set the volume of the delay (wet) signal
In general, short delays make a sound seem larger and longer delays create “space,” but playing with delays can create cool rhythm affects or ambience in your sound.
Examples:
Dry guitar playing open chords:
The same recording with a single, short (“slap”) delay added (feedback set to “1”, mix around 30%):
The same recording with a dotted 1/8th note delay with several repeats: