Is the Feedback Freeze function supposed to go into self-oscillation, like a delay would?

It seems to for me, and I was expecting more of a hold kind of freeze, like the Blackhole Plugin, or the Adrian Utley Space video a while back. What I’m getting swells into a mess relatively quickly. It’s probably user error, but am I missing something? The manual is sadly inadequate about the feedback freeze function.

Any help would be appreciated.