No, the computer is not included with Musebook. The $900 version is the software for acoustic pianos (using a tablet PC's mic input) and the $600 is the software for those using a MIDI keyboard and a laptop with MIDI In. Rather expensive by the time you add the PC.

The Music Pad Pro is an all-in-one product and includes both hardware and software. Since the MPP is a Linux-based unit, I wonder if you can boot the MPP to Linux rather than the MPP software? And could run you own Linux apps? Hmmmmm...