In reply to:

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I thought that the r3mix settings had become obsolete last month, replaced by --alt-preset, supported since Lame 3.91

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in lame 3.91, the "alt-preset" stuff got a lot of improvements and is now considered to be the best in terms of quality and size.

while --r3mix is just a shortcut for several different switches, --alt-preset actually changes the way the internals work.

Read the Changelog for LAME and you'll find a lot of useful info about --alt-preset

later,
ajay

later,
ajay