MP3 Doctor is an editing tool that lets you check, modify, and improve all your MP3s and WAVs in several ways. You can repair imperfect songs or modify them with trimming, equalizing, resampling, and a very efficient and improved normalization feature, and more (stretch, pitch, karaoke...). The goal is to let you maintain a similar quality, volume and sound on all your existing MP3s. In addition, it comes with encode and decode options (MP3 to WAV / WAV to MP3). You can modify hundreds of files with one click using 'Batch' mode or use 'Single' mode to process one file at time. In addition it can handle ID tags of MP3 files.