lower case in Parentheses only

Hello, I'm new to this program and would like to have some help with renaming.
I need lower case in Parentheses only:

from:

"BORDERLINE - Behind Blue Eyes (Extended Remix)".mp3

to:

"BORDERLINE - Behind Blue Eyes (extended remix)".mp3


Any advise really appreciated, Thanks

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Reply to #1:
1. Copy and paste the following into Notepad and save as LC-ExtendedRemix.aren
(Note: make sure it doesn't end in .txt, it must end in .aren)
2. Double-click on this new file and it will open as a preset in Advanced Renamer.
3. You can save to your presets folder if required for future work. Add your files from there.

[header]
type=preset
application=Advanced Renamer 3.78
application_version=3780100
batchmode=rename

[namecollision]
separator=_
pattern=
rule=fail

[methods]
method0000=methodname:"newcase"; active:"1"; casetype:"lowercase_pattern"; applyto:"name"; pattern:"\(([^()]+)\)"; regularexpressions:"1";

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