They do not make voice effects, but they will make a variety of emotions and the sound effects associated with them depending on the situation. (nookipedia.com)
The mic would be in the middle of the room, so that the actors could deliver their lines from different angles in order to create that feeling of a multilayered voice effect. (thexboxhub.com)
I wished that the game had the actual noises these professional players made when hitting that cross-court smash, but instead you the odd canned voice effect if anything at all. (cogconnected.com)