https://www.steinberg.net/It's apparently some musical program.
I use Midisoft Studio, it puts midi files into musical notation (and you can find midi files of most classical repertoire at www.classicalarchives.com).It helped me a lot with a problem of crossed rhythms. For that kind of things I found it invaluable (you can put it at a comfortable tempo and just play the notes at time).Also I have put it to play the violin part of a beautiful sonata from Bach, and I play the piano part. It is fun.Javier