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Thread: iTunes Soundcheck

  1. #1
    dBpoweramp Guru
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    iTunes Soundcheck

    When converting flac to mp3, I use the ReplayGain DSP to write Track Gain, Album Gain and the iTunNorm tag which, as I understand it, is used by iTunes/iPod to implement iTunes Soundcheck.

    Previously, I was using MP3Tag to write this tag.

    I have noticed that dBpoweramp writes an 'iTunNorm' tag while MP3Tag writes a 'Comment iTunNorm' tag

    Please can anyone advise? What is the difference, do I need both, which one does iTunes use? etc.

  2. #2
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    Re: iTunes Soundcheck

    Does anyone with an iPod using soundcheck have an advice on the above post?

  3. #3
    dBpoweramp Enthusiast chileboy's Avatar
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    Re: iTunes Soundcheck

    'iTunNorm' is used with AAC (m4a) files, whereas 'Comment iTunNorm' is for MP3.

    I don't know if iTunes (or the iPod) will recognize the former in an MP3 file. I still use MP3TAG (after ripping with dBpoweramp) with a custom Action to copy my RG values to the proper tag, depending on the file type.

  4. #4
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    Re: iTunes Soundcheck

    Quote Originally Posted by mville View Post
    When converting flac to mp3, I use the ReplayGain DSP to write Track Gain, Album Gain and the iTunNorm tag which, as I understand it, is used by iTunes/iPod to implement iTunes Soundcheck.

    Previously, I was using MP3Tag to write this tag.

    I have noticed that dBpoweramp writes an 'iTunNorm' tag while MP3Tag writes a 'Comment iTunNorm' tag

    Please can anyone advise? What is the difference, do I need both, which one does iTunes use? etc.
    I can confirm the same thing (one comment iTunNorm and the other just iTunNorm (which is the way I used to have to do it for AAC files using the mp3tag approach). Tried a bit of testing to see if itunes automatically picked up the dbpa iTunNorm without itunes doing its own analysis. Based on a really quick test, it appears that itunes is NOT using the iTunNorm value created by dbpa (instead it does its own soundcheck determination). But if I use the mp3tag method (creating COMMENT iTunNorm tag for mp3, itunes does use it for soundcheck). I'll play with it a bit more. But seems to be a problem. May derive from the fact that even in mp3tag, I had to create "COMMENT iTunNorm" for mp3 files and only "iTunNorm" for AAC(m4a) files in order for itunes to use for soundcheck values.

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