Changing gain in batch processor

Hi guys!
Can you help me in adding gain to many files if there is no “Change gain” option in plug-in section in Batch Processor??
Thanx in advance!

Use this plugin:
2014-05-21_13-02-05.png
For advanced use, check the “Meta Leveler” plugin in the Batch processor.

Thanx a lot!! It helped!!
Cheers!