I didn't talk about the line input being balanced, maybe you didn't understand.
As you should know, when a big live uses some kind of keyboard the cable used isn't a 2 or 3 meters cable as you talk about. I've used many keyboards on those situations. Having balanced outputs on the SD1 would be great because no DI box would have to be used.
Having unbalanced master outputs instead of balanced isn't a non-feature, but a big flaw on this professional keyboard!
This keyboard is not a toy! It's a professional one! a small casio is a toy with unbalanced outs but on the SD1.... I can't see why they didn't put them...
I, of course, have a mixer but only use it for the SD1 (with the vocals on the SD1), for monitoring and for a CD player. Weel... when I don't need monitoring, why should I take the mixer out if I had a line in on the keyboard?
Do you now understand my point of view?
And I DIDN'T SAID this was a bad keyboard! if it wasn't I hadn't bought it!

but I still think there are some minor flaws, like these.
Luis Santos