Can't add much more to this, except, I am constantly calling up voices and styles on the fly. I have made maybe 100 registrations, most of them while playing on the job.
I will get a request, or select a song, find a style, pick a lead instrument, set the tempo and play it. Usually during the song, I will change lead instruments at least once. If it works out well, I save it to registration, so next time I want to do that song it is one second away.
I also will call up text files and the occasional midi file. Everything works flawlessly. I have only tested most of the other features, including the MP3 player, wav player, Keynote feature, etc.
BTW, I know of at least half a dozen PSR910s that have failed almost immediately and have had to be sent back. I suspect there are many more than those I've heard about.
I had a bad PSR900 that had to be exchanged when they came out. I had a Roland G800 on which the joystick spring broke after one week.
I also know there are lots of Audya users in Europe who are using their keyboards every day without crashes.
Tony, if I were you, I would have demanded my money back long ago. I think they would have done it instantly. After all this time, I'm not so sure.
DonM