When creating keyframes on timeline, why does it sometimes add bezier handles and sometimes not?

OK, so one of the key steps in my workflow is to do a pass of manual audio 'normalization'. Yeah, I keep getting the feeling that there might be automated tools that could do a better job, but I'm also listening for content.
But what is driving me a little crazy right now is that sometimes, the ctrl-click adds a normal keyframe and other times, it adds a control handle for a bezier curve. This is especially frequent when doing speed ramps, but it's just so inconsistent that it drives me nuts.
I am working on one timeline and halfway through the sequence, it comes to a clip where it ALWAYS adds bezier curves. And when I try to drag the keyframe down, it grabs the bezier handle instead, creating this bizarre S curve.
I just don't know what I'm doing differently in that segment compared to other places. Hundreds, if not thousands of edits like this and I haven't come across a problem like this.
Undo, and do it again causes the same thing.
But one segment over, creating keyframes doesn't create any bezier handles.
Production Premium CS6

This is helpful as it explains why suddenly there are a few in a row that are bezier.
But it doesn't explain what it is that I did to make them bezier in the first place. It just seems random. I'm just control-clicking on the timeline.
When I get back in the office, I'll check on this a bit more carefully.

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