I had a 5000 for three years before I purchased the 7000, and found it to be the best keyboard I had ever owned. I had many keyboards and found the kn5000 to be not only the best, but also the easiest when you get used to it's OS. It is only as complicated as you make it. Start out with the basics and learn one thing at a time. I played gigs with it and it had a nonworking disk drive, which is why I can't answer the question of volume because at that time I didn't use midi.
It is a great workhorse. Hang in there.

Bernie