I can't say what you were hearing was this or that . I didn't hear the calls to determine whether it was a tom or hen . It is possible it was either . Most likely a gang of broodless hens or gobblers . It is also a possibility it was a lone gobbler . Very independant fellers they are . It's not uncommon to have one holler back at you but never show himself .
Sounds like you are in the right area for this fall season . I would recommend scouting early and late in the day if at all possible . Do more listening than anything else . Slowly move about to read the ground sign . I do not recommend calling to the birds before season , though I will admit I have done in the past myself . Turkeys , like most wildlife , have a far better memory than a human . Most stuff for us takes repitition and study , whereas they only need one lesson .
Your time AMONG the turkeys , in silence, and stone still , will be your greatest advantage between now and season . WATCHIN' 'n' LISTENIN' .
One more tip ,,,if you ain't already doing it ,,,keep a detailed journal of each time your in the woods ,,whether scouting , hunting or just loafing .