tebasuna51...thanks again.
I read the pdf at the link you gave, and if I understand correctly then aften uses the -smix and -cmix settings as the default for telling the decoder the stereo downmix levels when xbis1 extended data has not been specified. These are overridden by the xbis setting, if they are set. These can subsequently be over riden again by the user if such an option exists on the playback device.
OK, I'll probably not bother setting the xbis settings to be honest and just go with the defaults, as specified by -cmix and -smix in aften. My early tests using aften do give great results using these defaults.
I don't 'think' I have any more questions .... famous last words !
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