Case conversion leaving parenthesis intact

i would like to know if i can capitalize all first letters from words in filename leaving the words in paranthesis unchanged

almodovar - Ne ME quittez pas (ATMOS).mp3
Convert to:
Almodovar - Ne Me Quittez Pas (ATMOS).mp3

thank you
ps. i have already tried hard but with no success.

See the scripting functions help with special attention to $caps2()
" Case conversion Normal (without changing uppercase characters)"

use the scripting function in an action of the type "Format value" or Convert>Tag-Tag.
if you want to manipulate only the

then please be warned that occasionally those changes are not registered by the file system as case changes do not count as real renaming.
In general: I would get the tag data right and then construct a filename from there.