As the Titel says. I would like to learn piano. So I thought a Guitar Hero clone on PC with MIDI Keyboard support and community made levels would be a good idea.
I don't know. There's this post on their forums which talks about why development of version 11 is taking so long, but the post is also four years old. Unfortunately, since it's not open source we can't tell exactly what's going on.
Synthesia has already been mentioned but ill second it for learning piano. If you want a more Guitar Hero vibe there is Clone Hero. I havent tried it but its open source and has options for multiple instruments. Can't really get closer to Guitar Hero from what ive seen.
I would just use one of those controllers and plug it into an actual DAW like Renoise. I had fun with guitar hero but I was also playing/learning guitar at the same time and before I even played guitar hero for the first time, and I just didn't keep up with guitar hero but I did continue playing guitar.