I just find a step by step guide on how to convert all kinds of CAF audio including 6 channel CAF (CAF with 5.1 surround sound) to MP3
Besides converting CAF to MP3, this guide also applies to convert CAF to lossless audio like Convert CAF to Apple Lossless ALAC, Monkey’ audio APE, FLAC, WAV and etc. It also can convert CAF to AIFF, AU, RA, M4A, AC3, ACC, WMA, MP2, DTS, OGG and etc.
Moreover, this guide also helps to increase CAF audio volume; join several CAF files into one; trim audio segment; adjust audio codec, sample rate, audio channels; batch convert CAF files and etc.