These were the only sounds I captured from Cheetham Hill and Bulloch Hall. The whistling sounds from Cheetham were clear enough to be heard by all of us. Jenn even commented on hearing it accompanied by a “Hey”. I was not able to hear that on the recording, but you can be the judge of that. As for Bulloch Hall, it sounded like a door closing and rattling. Ryan would like me to go back over these recordings since he and the rest of the group heard whispering at Cheetham Hill. I did not hear at the time nor upon examination of the recordings, but will attempt to see if anything can possibly heard. I haven’t had a chance yet to go over Marietta Cemetery, I’ve been busy with work and Christmas prep. I’ll make it a point to go over Marietta and the other recordings tomorrow.
Update: Upon further review of the part of Cheatham Hill where the rest of the group claimed to hear whispering, I did in fact here whispering on the recording. However, when I listened closer it turned out to only be Ryan whispering to me or some other members whispering. It was nothing paranormal that I could determine.
Andy Roo
diezombee
steeleryan
Haunted Georgia - Hauntings & Ghosts in Atlanta, Marietta, Kennesaw, Roswell, Savannah, Albany, Canton, Smyrna, Georgia 
Yeah I remember them talking about the whistling there. However, do you think it could be a bird/bat? I did notice there is a “click” or soft “bang” right before the whistle noise. Can you slow it down and have a listen? There is also a soft rattle afterward.
As for Bulloch Hall, I cannot tell what the noise is. It’s loud and definitely rattles. I hear it twice, the second time we say “ssssh”. Between 17-19 seconds I also hear it very faintly in the background. Very loud, very clear, I’m clueless.