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However, it's the first iteration of the Hydra (before it was called "Hydra") and only holds eight calibrations (besides using different flash software and not including a bypass or no-start mode).
Old thread. While it's not specifically mentioned (to be found in a search), it's demonstrated here. [LINK]
There was mention of dimming (but no concrete reply). I'll be looking into this.
The dimming thing turns out to be pretty straightforward: Just press the "down" button for 3 seconds, then let up to turn the brightness down. Do the same thing to the up button to turn it back up.