You can source plugins from various marketplaces and developer sites. Modern Audition supports , and Audio Units (AU) (macOS only) formats. How to Add third-party plug-ins for Adobe Audition
Downloading and installing plugins is the best way to transform from a standard editor into a powerhouse for professional sound design, podcasting, and music production. Whether you need to clean up messy dialogue or add cinematic reverb, third-party plugins provide tools that go beyond the built-in stock effects. Where to Find and Download Plugins download plugins for adobe audition