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1. ACC is Advanced audio coding, made up of lossly compressed files with higher sound quality than the MP3 MP3 are very small files that are compressed and the quality of each file can range from low quality to high quality. AIFF is Audio interchange file format. Are uncompressed and bigger files. most commonly used to store audio and video. Comes in higher quality. 2. ACC files - 7MB MPEG file - 4.1 MB MPEG file - 3.3MB AIFF file- 36 MB MPEG file youtube version- 3.5MB 3. I didnt hear any difference in the different kind of file formats in my music at all. 4. AIFF would be what i would format my music with because that was the standard usually used to rip your cds with.