Disaster!
I was programming a patch (Stereoshift -> Dualgate). While I was twiddling around with different threshold settings and the like, the Eventide froze, and wouldn't respond to either keypad commands or MIDI commands. So, I turned it off.
The unit happily reset, but unfortunately, the gate that I had programmed won't turn off. It is present on all my patches. It is present on all factory patches.
How do I turn the darn thing off?