Audacity Portable is the popular Audacity audio editor packaged as a portable app

Audacity is a free audio editor. You can record sounds, play sounds, import and export WAV, AIFF, and MP3 files, and more. Use it to edit your sounds using Cut, Copy and Paste (with unlimited Undo), mix tracks together, or apply effects to your recordings. Audacity is a software that allows you to record andplay sounds