Ideal Changes for Season 29

Yes, they do. Not as much (and not as badly) as they did back in the early '90s, but they do. Since the audience seating area was smaller at the start of Season 24, the show probably felt that the audience wasn't as loud as it was before, so that's around the time they started using today's versions, though some of the sounds used when they taped at CBS Studios carried over for the first week or so at Sony (anybody else find it ironic that the show used obvious canned sounds when taping at the same studio where The Price is Right tapes now, and the audience never shuts up on that show nowadays? ). Sometimes the groans after a bad letter or bad spin are stock groans and added in post-production. In fact, if you have bigjon06's Wheel fangame, the groan you hear as soon as time runs out in the bonus round was taken straight from the show a few years ago, and the same one could still be heard in many episodes of this past season. Unfortunately, I can't link any examples thanks to Sony getting rid of rashad1428's YouTube account, but it could be heard when the Toss Up puzzle "STARBOARD SIDE" went unsolved during "Gone Fishing" (?) week.

In an episode during "Sand and Sea" week, a contestant landed on the Million Dollar Wedge on the first spin of the game. Since the audience must not have noticed it for some reason, a gasping sound was added in.

Sometimes, laughs are added in during Pat's jokes, too. Although not exactly related to that, here's an interesting discovery I made last year: to promote April Fools 2010, the show uploaded the clip of Pat revealed as bald on the April Fools site a few days before. When Vanna "unveiled" Pat, there was no reaction sounds from the audience, meaning that the segment was pre-recorded, then shown to the audience for their reactions later, which explains why their reactions were more of amusement than shock, because they saw it coming.

If you watch the video of Michelle Lowenstein's million dollar win, listen closely to the applause in the background. You'll notice these female screams every minute or so. These screams are part of a stock applause track that's used during every show not recorded on location. You can mainly hear it used during Pat and Vanna's entrance, when a puzzle is solved, while going to commercial breaks, and especially during the Prize Puzzle trip description and Bonus Round wins. In fact, if you watch any episode from the last season of "Hollywood Squares," you'll hear the same track used during the show's intro.

EDIT: Just watched a 2005 episode and they still used the track. I don't think it was used the whole time they've been taping at Sony, though.