"Hard Duty is a mod taking place after the Resonance Cascade and the death of Nihilanth. Back on Earth, you were assigned to a different job this time. Still being a scientist of Black Mesa Research Facility with a PhD, you will be tasked to test various lab equipment. Unfortunately, it turns out it will be a complete fiasco but you will soon realize it is just more than a simple malfunction... what has happened? Find out the truth.Take the control of the famous Gordon Freeman and head over many places in fifteen chapters worth of riddles, action and stories."
It is extremely important that the format of the WAV files is PCM,11,025 Hz, 16 Bit, Mono.
If possible, could the voice be similar to the original Barney: https://www.youtube.com/watch?v=EIHFHw5244Y
Same goes for the scientist: https://www.youtube.com/watch?v=scmURokPzDA