Hi Gary and John
I sure wish for the same thing; an explanation.
The presets are the styles and the programs are under the program button combined with the instrument buttons.
I haven't done much with the programs other than play them, but there is a world of possibilities for editing the groups within the programs and making your own combies.
AJ's video's will clear up a lot of questions when they are done.
pa4X 76 ,SX900, Audya 76,Yamaha S970 , vArranger, Hammond SK1, Ketron SD40, Centerpoint Space Station, Bose compact