I was wondering if they used the same voice artists as for some of their other games - the credits to their Xena Multipath Movies are on youtube; that game has the same sound editors as Cyberswine (Gregory Hodge and Peter O'Brien) so it would make sense if they reused voice actors (the ones credited on Xena are Heidi Anderson, Susan Davis, Scott McDonald, Jasmin Paul, Nicholas Omana and Lou Wagner). Sure enough, googling for Nicholas Omana confirms that he was also in Cyberswine, according to this talent management website:
Nick has created hundreds of character voices for Disney, Hanna-Barbera, Marikami/Wolf, and Warner Brothers, plus voiced characters for game projects such as James Bond: Golden Eye 2, Enter the Matrix, X-Men, Cyberswine, XComm, Xena: Warrior Princess, Gravity Angels, and Popeye.
That's one of the actors, anyway! Unsure which character he voiced.