Mp3Doctor

Mp3Doctor offers audio software capable of encoding, decoding, resample, normalize, fix, trim, equalize, modify the tempo (without modify pitch) modify pitch without changing the tempo. Since 2001 Mp3Doctor ahs being sold in CNET.

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Mp3Doctor Pro
Trial version
Mp3Doctor PRO: Master Your MP3 Volume and Quality
Windows
SuperMp3Normalizer
Trial version
SuperMp3Normalizer: Even Volume for Your MP3s
Windows
MP3Doctor
Trial version
Check, modify, and improve the quality of your MP3 files.
Windows