Ducker

“Ducking is an audio effect commonly used in radio and pop music, especially dance music.” ~ Wikipedia Ducker turns your Mac into a phenomenal minimalistic DJ machine. With just one button and a slider, it could not be easier to learn. While you hold Shift, your machine is partially muted so you can have a quick chat, do a smooth voice over, or pick up a phone without turning off your music entirely. It’s also fun to just play around with. Features: • Duck by holding Shift or clicking the button. • Adjustable ducking volume. • Support for retina screens.