AudioDelay

AudioDelay[audio, delay] creates audio by adding repeated decaying echos to audio spaced by the specified delay.

AudioDelay[audio, delay, feedback] uses the specified feedback as the amount of signal to preserve during each repetition.

AudioDelay[audio, delay, feedback, mix] uses mix to control the ratio between original and delayed audio.

Examples

Add an echo effect:

audio = ExampleData[{"Audio", "Bird"}];
AudioDelay[audio, Quantity[0.3, "Seconds"], 0.5]

Please visit the official Wolfram Language Reference for more details.