It was latching. I don't think these old Corbin Drivers allowed you to choose the current.
I honestly don't recall. It's been quite a while. But I can tell you that with this set-up, precise control over mixed colors is impossible, and red and amber tend to dominate when mixed with other colors. It would be great to see a driver specifically designed for color mixing, but I don't know of one that would work in a saber.
Sorry, I thought it would be clear from the diagram. The leads to the driver switch go on 1 and 7. (Polarity doesn't matter.) The positive lead from the 616 board's LED goes to 2, and the negative goes to 6.