Smart Soloist (Massachusets) uses the orchestraparts of my Chopinconcertos op.11 + op.21 and the Grand Polonaise brilliant op.22 in their Software, which allows the User who needs an accompaniment of those Chopin concertos to customize the tempo for his own instrumental abilities and personal musical conception without reduction in the soundquality.
For a first impression see two Youtube videos from the last movement in op.11:
and the Beginn of the Grand Polonaise op.22