Good news: The automated horns are no longer in use.
Bad news: All 6 East-West crossings on the main are now "Quiet Zones".
City of Ames press release
The crossings along the North-South Jewell Subdivision still have escaped the whistle ban, however now only 2 crossings remain that are guarded with flashing lights only. 24th, 20th, and 13th street have quad gate installs now, and Bloomington Road has been converted to a divided 4 lane highway with gates that block off the highway making going around the down gate impossible. (Almost exactly like this except for the AHS system.)
The city continues to state that as the Jewell line only sees 2-4 train movements per day, they are not actively pursuing quiet zones for these crossings yet.

