Sony CDX-M850MP - Manual (Page 30)

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About ID3 tag version 2
Although not a malfunction, the following occurs
when an MP3 file containing ID3 tag ver.2 is
played:
– When skipping a portion of ID3 tag ver.2 (at the
beginning of the track), sound is not output.
Skip time changes depending ID3 tag ver.2
capacity.
– The displayed elapsed playing time when
skipping a portion of ID3 tag ver.2 is inaccurate.
For MP3 files of a bit rate other than 128 kbps,
time is not displayed accurately during playback.
– When an MP3 file is created with MP3
conversion software, ID3 tag ver.2 will
automatically be written.