@LPdan In my experience, these types of dimmer boards were auto transformers, rather than heat generating / power wasting rheostats.
@n1ist The majority of the 'Broomstick' mastered piano boards were power wasting / heat generating resistance rheostat boards.
If it had been in the disco era, you could've been switching during cues.
Yes, and any softkey on the SQ-series can be mapped to "Clear All Cues", too, which doesn't excuse them from not having dedicated a button to it either.
Understood: Not normally found on installations with less than 3 horizontal rows due to the physical contortions required to simultaneously coordinate 3 to 6 masters. @JonCarter ; help me out here, I'm not explaining my self well.My experience with that "ship's wheel" is that it was a slow motion wheel. Used to fade out the lights at the end of a scene. You could set the "T" handles on each dimmer to lock in as the level of the slo-mo wheel reached it's setting, it would latch in. Only problem is that it wasn't proportionate to the individual levels, so by the end of the fade all levers were moving together at the same level.