> why the Gate LED in my a190 is always on, unconnected

I never really thought about this before, but now that you mention it, the gate LED on my A-190-3 is always on *except* when the gate is actually triggered or released. It's as if it's the "nothing's changed in the last few milliseconds" indicator or something. I think it's normal, and nothing to worry about, anyway.

Similarly, in both my A-140s the H/L/M positions on the switch seem to be low/high/medium respectively, as if they're in the wrong order... but it works, and they match, so I assume it's meant to be like that!

All the best,
Zoë.