Thanks for the reply. Yes I am aware of sampler devices. However, the only ones that I can find these days are beat boxes, and they are not what I want at all. I won't pay extra for functions that I will never use. Currently I have a keyboard hooked up to Reason, and I know how that works.
I am also aware what MIDI is, and what samples are. However, I continue to have trouble finding a device that implements MIDI instructions from a controller (like a keyboard) with a custom sound bank in a live performance setting, with high polyphony.

I am not sure how much more explicit I can get here.

I need a device that I can upload quality or custom sound banks to, that can be controlled with a midi piano, with some editable effects as well. I don't want that extra beat crap, just the sounds and variations.