Layering instruments is simply having 2 instruments playing off the same MIDI track. In MC8 I copy the Pianissimo MIDI track and reassign it to the VSCO2 Piano. Each piano can have it's own reverb/effect or you can load the reverb onto a Send track and route the pianos to it dialing as much reverb as you want. I prefer the 1st way as I don't use any effects on the Pianissimo track, and sometimes not at all.
BREVERB2 is a plugin from Overloud. https://overloud.com/products/breverb-2
, though any reverb can be used.
Although you can assign any reverb or effect you want,"sound" is subjective to the listener as to what sounds good or realistic.
Mixcraft 8.1 Pro Studio (418), Windows 10 Alienware laptop, Windows 10 64 bit, Behringer UFX1204USB mixer/interface.