If you are currently using an older version or are new to the software, here is how to set it up: SoundSource Release Notes - Rogue Amoeba
Fast switching between input and output devices directly from the menu bar using a revamped interface or global keyboard shortcuts. Getting Started with Version 5.3.8
is a maintenance update for the popular macOS audio control utility by Rogue Amoeba . While it does not introduce major new features—those were primarily debuted in the SoundSource 5.3 release —it focuses on stability, bug fixes, and refining existing tools to ensure a seamless experience on modern macOS versions. Core Capabilities of SoundSource 5
Adjust the volume of individual apps relative to each other and redirect audio from specific apps to different output devices (e.g., play music through speakers while routing a Zoom call to a headset).