I'm afraid I'm a heretic. I bought my original arranger as a cheap MIDI input device to record classical music that I would never hear otherwise. That's not to say I could play it well but Cakewalk and others do a grand job of clearing up mistakes. And there were other methods of recording music such as scanning the score. Having discovered I was a frustrated organist (as well as a piano player) I bought a PSR-740, mostly for my own amusement, but also for playing the odd gig at local spots. So I'm not a real musician any more having done all my good stuff more years ago than I care to admit.
Bryan