ITunes 11 MP3/320  -  Joint or normal stereo for best quality ? Thanks!

iTunes 11   encoding MP3 @ 320  -    Joint or normal stereo for best quality ?    Thanks!

OK, I digged a bit deeper.......
Apparently, the common LAME MP3 encoder uses JOINT mode throughout bitrates ...... ( have a look at the wikipedia pages for MP3/joint stereo) 
This leads to a) smaller files and/or  b) gives or frees up "bandwidth for signal encoding when/if necessary.
The iTunes encoders algorithms are unknown, thus we need Apple to help with this issue.
If   "normal"  = separate stereo, i.e. separate encoding of the left and right audio channel, then there might be rather a quality loss despite high bitrates and large files, because that would mean using 160kbps/channel only , as MP3s are limited to 320.
Until Apple does not specify and explain this in detail, I myself will no longer use iTunes for encoding.
(  @keeferaf, many thanks, in "userdefined-MP3-encoding" you can select those  values  )

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