Supports almost all audio and music file formats including MP3, WAV, VOX, GSM, WMA, AU, AIF, FLAC, real audio, OGG, AAC, M4A, MID, AMR, and more.
If you tell me which features you need (e.g., noise reduction, batch processing, VST support), I can recommend the best legal option or a step-by-step workflow in a free editor to achieve the same results.