Using Itunes To Optimize Your Sound Files; Enable Your Ipod For Disk Use; Itunes Setup For Mac Or Pc; No Compression (Wav) - Cortex DMIX-600 Product Manual

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Settings for importing as WAV.
But remember files that were downloaded or ripped to Mp3
will not sound any better by converting them to this format
all you will be doing will be increasing thier size 300%!