In the Triton series, you could use multiple MOSS programs when creating a combination. Midi capbilities are extensive. This box is loaded, and yes it has a decent sampler. Having said that,on thier own the Korg Triton piano sounds are average, very tinty, almost too bright. However,playing live and in layers, this works well in cutting through the mix.
Horns are superb.
Electric pianos, are good alone, great when layered with my Roland XV3080. Guitar sounds are sparse, concentrated toward acoustic, but they are passable. The drums are suberb. They are imaginitive and work well. They are leaned more toward tehcno field, but thier are enough to sastify all musical disciplines.