>>206
Appleの説明
https://developer.apple.com/library/mac/technotes/tn2237/_index.html#//apple_ref/doc/uid/DTS40008147-CH1-SUBSECTION11
>Recommended as a compromise between VBR and ABR.

たぶんhalb27版LAMEみたいなメリットがあるんじゃないかな。
http://www.rarewares.org/mp3-lame-bundle.php#lame-current-halb27
http://www.hydrogenaud.io/forums/index.php?act=Search&;amp;CODE=gettopicsuser&mid=25015