Two notes has the advantage to simulate also the power amp.
Otherwise I tested some analog simulation: Palmer PDI 03 and ADA GCS-2. Quite similar. But the best is the one from a French manufacturer. There are tubes to create a slight compression:
http://www.fredamp.fr/Products/144/275/FAC-Tube-Hp-Simulation
HP = haut-parleur = speaker
With analog simulations, you get a better feel in playing. But it’s a little less realistic when you record.
