Thank you,Gary and Scott for your time and good explanation!

Scott,PRS1500 have mass storage(smart media),I have 128MB, and think this is more than i need.
Have USB to,but i only use to transfer data between kb. and pc.

I'm mostly play in seasson(from Juni to September)
Play accordion from long time and guitar to,and decide switch to kb.

Bouth PSR15 because think dont need vocaliser(on the stage is two,three of us and sing in two or three voices)
and think this is pretty good kb for me(cheaper too)
Almost everything i play by ear. Ofcourse ,have book of words in front of me,and in some songs
above the words put the name of accord what i must play.

So, i'm new in this world of playin,and i try to put things like you are,
think this is very good idea put some prefix in the name of folder and force to last page
because when switch beetwen midi,user style,user voice,registrations,always see folder in every area

I only dont undrestand music finder. Can i associate with user styles(with different OTS)?
Where i find explanations about makin my own MF?

Thanks for sharing your expiriences with me !!