Yes, they are. I've written several tutorials, though, based upon what I learned from the manuals,plus practical experience using the products first hand.
Gary
Actually, there is a wealth of info on PSR
Tutorial...hence the name.
There is also a section of the forum called "Secrets You Won't Find in the Manual".

Great stuff all around.
Gary, you have contributed much to PSR Tutorial, both in the main section and on the forum...many have learned a lot from your information, including me.
You have my gratitude.
Ian
_________________________
Yamaha Tyros4, Yamaha MS-60S Powered Monitors(2), Yamaha CS-01, Yamaha TQ-5, Yamaha PSR-S775.