Can any power supply with floating outputs be rigged up with its outputs in series, subject to output power limits, without specific front-panel switches/settings etc? I'd assume 'yes' and that any front panel switching is to ensure that the channel displays were correct for this setup or even to do this with internal switching to save on cabling. Without any settings I'd further assume you'd have to do the calculation of total voltage 'in-head' as it where. I've seen a supply with parallel/series switch so that's obvious, a supply with neither but info in the manual that parallel/series is possible (doesn't say what it would display), and a supply with a parallel switch but not series. The latter two have a track setting to ensure that channels follow a master which I would think would be useful in a series configuration to ensure that all channels supplied the same voltage, as would a 'all on/off' switch. I'm not picking on or thinking of any supply in particular, it's just a generic question, apropos of nothing in particular except interest. I've never actually had a need to do this and in fact the only 'fancy' thing I've done is create a +ve/-ve rail.