You're on a call in Zoom and want music playing in the background — but turning up Apple Music means turning up everything, including the call. What it does - Per-app volume sliders — turn any app up or down independently, right from the menu bar - Per-app output routing — send one app to your Bluetooth speaker, another to your headphones, another to your Mac's built-in speakers, all running simultaneously - Mute, individually — silence one app's sound without touching anything else