If you need a truly free, legal, and portable audio editor, consider:
Advanced filters to scrub away hiss, hums, and clicks from old vinyl rips or poor mic setups.
When used as a standalone tool (portable or installed), Nero Wave Editor provides:
Use Audacity if you need multi-track recording. Use Nero Wave Editor Portable if you need lightning-fast stereo editing, superior noise reduction, and batch processing on the go.
If you’d like, I can: