Thanks Yaroslav for this news on Lame 3.91 which has now reached a stable stage of version 3.91, changes below:
Changes Since v3.90
a.. Darin Morrison: Bugfix for --alt-preset (for content with low volume, clean vocals), only important for the "fast standard" preset
b.. Alexander Leidinger:
c.. add some missing files to the distribution
d.. add --alt-preset to the man page