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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?

What type of audio file is it?


What type of audio file is it?

MP3 


Try converting the files to 320kbps/44.1kHz.


Thanks, that has fixed it.