Hmmm, I don’t know. Looks like AIFF-C is the standard when converting from itunes:
From https://en.wikipedia.org/wiki/Audio_Interchange_File_Format
Apple uses this new little-endian AIFF type as its standard on Mac OS X. When a file is imported to or exported from iTunes in “AIFF” format, it is actually AIFF-C/sowt that is being used. When audio from an audio CD is imported by dragging to the Mac OS X Desktop, the resulting file is also an AIFF-C/sowt. In all cases, Apple refers to the files simply as “AIFF”, and uses the “.aiff” extension.
I can’t remember if I’ve ever used itunes to convert audio, I usually use quicktime. I’d suggest exporting it from quicktime and see if that aiff give you better luck.
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