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how do I change a playlist track from Wav To MP3

I have a lot of playlists in iTunes and I want to transfer some to a USB "thumb drive" to use in my car. Some of the songs are AAC, some are WAV and the WAV files will not play on the USB drive. How can I convert them to MP3? Is there a "select all" way to do this that will change anything other than MP3 to MP3 and leave the current MP3 files alone?

Thanks in advance for your help.

最後更新：2017-08-30 09:06:40

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