My advice would be to not worry about which version of LAME to use. If memory serves, there have been regressions in certain samples in the past, but this isn't what you should concern yourself with. Major point releases are safe.3.99 is good. 3.98 is good. 3.97 is good. Etc., etc., etc.I would also suggest that you not perform any spectrum analysis or any other visual analysis on your music. Listen to it and enjoy it
for CBR I don't think there have been many changes between 3.93 and 3.99.