You can play recorded disks of a huge software catalogue:
There are recordings of all musical stiles:
Classical: Horrovitz, Rubinstein, Rachmaninov, Elly Ney, etc.
Musical: Phantom of the opera, hair, etc.
Jazz: famous pianists
Country
"Candlelight & Bar music"
The Symphony sound system adds an electronical sound to
the pure ayoustical piano sound: the whole orchestra or a Jazz band...
You can change
Volume: from very low to very loud continuously
Tempo: from 17 % to 200 % of original tempo
Transposition: 2 octaves high and low in half tone steps.
You can record your playing and replay right away: If
you take low tempo it is an extremely good way of self control study!
The MIDI-in -out or through mode gives you all the
chances for notation programs and sound equipments and communications with other
instruments of the MIDI-systems.
You can play at four hands with yourself.