Ah, I see. allowing *either* to write both ms values, or to write only total duty cycle ms, and control ON ms by moving duty cycle slider (having on ms value re-calculated automatically). that sounds ok, and would be, surely, sweet spot - although, I'm not sure how easy/hard to code it is.

I'm also + for showing hard limits in UI, AFAIK Copernicus is working on it, already.

/Estel