Nine months later, in December, a friend of mine was in north Florida attending the 2011 BFRO expedition. I suggested she check out the place where I had success with my recorder in March, and she spent 3 nights camped out and recording on her way home from the expedition. Happily, she too recorded some great vocals, better even than the ones I recorded. Her clip includes a moan howl, two whoops, some wood knocks, and a long wavering howl. But what's also notable in her clip is the voice of the main vocalizer. It sounds very similar to the vocalizer I recorded in March.
Here's a video-spectrogram that replays both clips and makes it easier to compare one clip to the other, while also highlighting some of the vocal features in each recording. I postponed publication of this post because I was just in Decatur County last week, hoping to record a third performance. But sadly that didn't happen, so there was nothing new to add to this video.