[vorbis] make lo-fi sound as good as RealAudio?

[Derek at CD Baby]

> > P.S.    Is this a bug?
> > oggenc -M 32 -q -1.0 --downmix YourSong.wav
> > oggenc -M 28 -q -1.0 --downmix YourSong.wav
> [equal results]
> 
> No, because -M will be ignored without --managed. When using --managed,

Hm. Nope! Try it. 
I just tested with and without " --managed" in the command line, and it was the same exact output (down to the byte).

The two tests were:
oggenc -M 28 --downmix --resample 32000 
oggenc -M 28 managed --downmix --resample 32000 
Same output.

<p>> you also want to use -b instead of -q. Using -b is always a good idea,
> as the encoder would assume the default of -b 112 (for 44.1kHz/stereo
> output, this is just an example) without it. This means it thinks it can
> use many bits, but ends up hammered down by the -M parameter, which
> results in bad quality.

Thank you!  Interesting!  Different reason, though: smaller file, same sound, when adding " -b 32" to it.

So - as of right now, this is my sweet setting, below:

#############################
oggenc -M 28 --downmix --resample 32000 -b 24 
#############################

Seems to get a very good sounding 26k bitrate file, which should work for almost any 33.6k-56k modem.

Though the setting of "oggenc -M 32 -q -1.0" sounds better, (when not resampling) file is almost 30% bigger for a difference only noticable on the highest frequencies, when wearing headphones.  Was about to go for that setting, but I think that modem stuttering would be a real problem for many people.

NOTE: try encoding some modern country music, like pop-country stuff.  Ohmygod!  I'm not a big fan of it, but it's got more treble than anything else I tested.  Good for revealing that high end dither.

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