https://convertio.co/formats/aac/
AAC (Advanced Audio Coding) Conversion Types — Convertio
AAC is a popular Audio file format, which you can convert into 55 another file formats such as MP3, WAV, M4A, etc. online and free without registration....
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https://www.mainconcept.com/aac
Advanced Audio Coding (AAC) Encoder and Decoder SDKs: MainConcept
Advanced Audio Coding (AAC) is the most powerful audio codec available today, representing the state of the art in natural audio coding
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