works fine, thx for the quick update. I did a little search on that matter and found some official apple documentation about the different encoding modes:
https://developer.apple.com/library/...1-SUBSECTION11
this gives the following order for the bitrate variation (high to low):
--tvbr, --cvbr, --abr, --cbr
according to this document cvbr uses the bitrate setting as a lower limit. so I'm not sure which one should be the correct choice, maybe I misled you. in terms of hitting the target rate --abr is the appropriate choice. --cvbr allows more variance but definitely results in a higher bitrate on average than the user selection. it's your decision in the end but I think regarding the user expection for the setting "average bitrate" the option --abr should be prefered (or you add a switch to the advanced settings like you suggested).
sorry for the confusion but hopefully I shed some light on qaac's encoding options.