Audacity Portable is the popular Audacity audio editor packaged as a portable app, so you can take your audio files along with everything you need to edit and record on the go.
You can place it on any USB flash drive, portable hard drive, iPod or a CD and use it on any PC, without leaving any information behind.

Recording:
· Record from microphone, line input, or other sources.
· Dub over existing tracks to create multi-track recordings.
· Record up to 16 channels at once (requires multi-channel hardware).
· Level meters can monitor volume levels before, during, and after recording.
Import and Export:
· Import and export WAV, AIFF, AU, and Ogg Vorbis files.
· Import MPEG audio (including MP2 and MP3 files) with libmad.
· Export MP3s with the optional LAME encoder library.
· Create WAV or AIFF files suitable for burning to CD.
· Import and export all file formats supported by libsndfile.
· Open raw (headerless) audio files using the "Import Raw" command.
· Note: Audacity does not currently support WMA, AAC, or most other proprietary or restricted file formats
Editing:
· Easy editing with Cut, Copy, Paste, and Delete.
· Use unlimited Undo (and Redo) to go back any number of steps.
· Very fast editing of large files.
· Edit and mix an unlimited number of tracks.
· Use the Drawing tool to alter individual sample points.
· Fade the volume up or down smoothly with the Envelope tool.
Effects:
· Change the pitch without altering the tempo, or vice-versa.
· Remove static, hiss, hum, or other constant background noises.
· Alter frequencies with Equalization, FFT Filter, and Bass Boost effects.
· Adjust volumes with Compressor, Amplify, and Normalize effects.
· Other built-in effects include: Echo, Phaser, Wahwah, Reverse
Sound Quality:
· Record and edit 16-bit, 24-bit, and 32-bit (floating point) samples.
· Record at up to 96 KHz.
· Sample rates and formats are converted using high-quality resampling and dithering.
· Mix tracks with different sample rates or formats, and Audacity will convert them automatically in realtime.
Plug-Ins:
· Add new effects with LADSPA plugins.
· Audacity includes some sample plugins by Steve Harris.
· Load VST plugins for Windows and Mac, with the optional VST Enabler.
· Write new effects with the built-in Nyquist programming language
Analysis:
· Spectrogram mode for visualizing frequencies.
· "Plot Spectrum" command for detailed frequency analysis.