No, Adobe never released an official "portable" version of Audition 3.0. Software marketed as "Adobe Audition 3.0 Portable" is typically created by third parties who have modified the original code to run without a standard installation process.

Adobe Audition 3 Portable is a powerful and feature-rich audio editing software that offers a comprehensive set of tools for audio editing, mixing, and mastering. While it may have some limitations, the portability and performance of Audition 3 Portable make it an attractive option for audio professionals and enthusiasts on the go.

Use at your own risk. Always scan downloads with VirusTotal and Malwarebytes before running.