Hi to the genesys,
I didn't have gigs in mind when proposing the above, although I do understand that a musician must PLAY somwhere else than his living room.

I too like the ideas you described, and the first thing that came in my mind was a set of keys with a PC within, like some keyboards that get some attention lately like NEKO or others.

On the other hand, Frank Rosenthal says he has used his equipment live succesfully, and I think some blokes here carry a laptop around in their gigs also.

We are halfway there.