I really like your fre:ac software and I would like to make a feature request for it.
When encoding audio to MP3 via LAME, the current options that can be set for it are:
But LAME has some more features, including a mode called 'dual channels' encoding. Even though what LAME does so well is variations of joint stereo encoding, the 'dual channels' mode may be useful in certain applications. I think it may come in handy when encoding binaural beat MP3's, as one would want a strict separation of left and right channels. I read about some LAME features (http://mirror.atrpms.net/ccrma/man/man1/lame.1.html) and it lists the following:
(f)orced joint stereo
When I look at the dropdown of dBpoweramp, it does have all modes listed. It looks like this:
Even though at 'dual channels' mode the encoding may be somewhat less optimized (from what I understand) a .mp3 file converted at 320kbps CBR is still 2.5 times smaller than a .flac rip (level 5).
Please consider. Thank you :)