After a lot of trial and error, I managed to figure out how to extract audio/voice clips from Tomb Raider 2013. (PC Version)
1.) I unpacked the bigfile.***.tiger files using Gibbed.TombRaider9.Unpack.
2.) After grouping all the .mul files together, I converted them to .fsb format with fsbii.
3.) And lastly, I used Aezay FSB Extractor to convert them to .mp3 format.
Hope, this helps! Good luck!