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I just added some tracks to my iTunes library, which is accessed by Sonos. They play fine in iTunes, but Sonos complains for each that it is  “unable to play <track> - it is encoded at unsupported sample rate 24b30464 Hz” (?!). iTunes reports them as being encoded at 44.1kHz. 
Any ideas?

Thanks, that has fixed it.


Try converting the files to 320kbps/44.1kHz.


What type of audio file is it?

MP3 


What type of audio file is it?