Regarding the sub outs:
I set up a friends Tyros(which I may end up with anyway...against my better judgement)to use the sub outs as a separate mix for the bass and drums. He likes to send bass to one channel of his mixer, and drums to another. Sounds like aux outs to me.
Mike,
Is there something about this configuration that baffles you? They work like the additional outputs on everything else. You can assign any thing to them for a more specific mix. That's the way I would expect them to work.
Fran,
You'll like:
1)hard drive
2)large screen
3)drum remix
4)key feel(better than some, worse than some)
5)weight
6)styles
7)drums
8)multipads
9)music database
10)vocal processor

You'l be disapointed with:

1)grand piano sound(subjective I know, but give I the edge to Roland)
2)61 keys
3)smf drum kits, and general playback. Tweaking is mandatory here.
4)auto vibrato in sweet voices(all the new ones have this)
5)vocal samples...no usable scats
6)polyphony is not allocated as well as Roland. The G has less dropouts.
7)too wide for 61 keys. Wasted space
8)Silver...yuk.
9)short keythrow. They bottom out faster than other brands
10)Forget this list .... you'll like it.