In cooperation with the famous pianist Paul Badura-Skoda, Modartt have constructed a Walter pianoforte add-on for Pianoteq. They say that this particular instrument was made around 1790 and has a powerful sound strengthened by its Viennese pianoforte action. Walter's instruments were frequently used by Mozart and were also praised by Beethoven.
Here's all the details from the Pianoteq website... Pianoforte: Walter
This is a physically modelled virtual copy of an Anton Walter pianoforte.
Anton Walter (1752-1826) was an important and famous Viennese instrument builder. He was a friend of Wolfgang Amadeus Mozart who owned one of his instruments and often used it in concerts. Ludwig van Beethoven also belonged to those who often praised the solid quality. By improving the Viennese pianoforte action, Walter managed to build instruments with a slightly more powerful sound than that of his competitors. The instruments are often used today as models for the construction of authentic copies. Pricing and Availability:
The add-on can be downloaded freely by all Pianoteq customers.