About unpack BNK files voice (Life is Strange)

In General, I want to make my own freaky-carbon monoxide voiceovers. I need to extract the voice files and replace them with your own. Unpacked .PCK files of voice changed for one test, doesn't work. Probably still need to unzip and BNK, change to pakanati back. Learned from one forum that I need to write a separate script in quickbms. In order to decompress. And I have a question, can anyone for fun will help, especially in writing the script? To participate in the modding, writing carbon of the script and voice acting