A fifth CD was added in 1996, entitled Hanna-Barbera Lost Treasures, and featured more sound effects, including sounds from Space Ghost and The Impossibles. Source: Internet
After attempting to craft the theme with different sound effects, Snow used a Proteus 2 rack-mount synth with an effect called "Whistling Joe". Source: Internet
Another improvement over Quake was that it was easier to select custom player models, skins, and sound effects because they could be selected from an in-game menu. Source: Internet
Although she did point out the music and sound effects might seem dated. Source: Internet
An additional cast member appeared as a non-speaking sound effects man. Source: Internet
Audio was not neglected either, having recruited Nine Inch Nails frontman Trent Reznor to facilitate unique sound effects and ambient music for the game. Source: Internet