Here ya go - doesn't drill down into settings but interesting all the same. Don't know, but I do know the 12position switch on mine was really graunchy, so I had the bright idea to dismantle and rebuild. Lots of scope for messing that job up but pleased I did it. ... On the subject of switches; what's the extra switch at the top of the panel on the lower unit that's been put in? A separate on/off switch?