i'm curently listening to the demos

Yes..after inserting the zip into the VA's drive..you will have to go into the disk page..There are styles on the zip..you can play directly from the disk[actually the VA has to load into ram..it takes a second or 2].
I would have to recall from memory to guide you..Why not study the manual first to get a basic idea how the disk works ..Then some of us should be able to help you.

how can i play the styles directly from the zip ?

i can't listen to midi files because i don't have any on the zip.....what does that mean ?

you guys - i have a question...does the roland va76 have a " layer " feature? like...i choose a flute, i press the key " C " and it sounds like i press " C " and " E "....do i have that ? the casio wk-3500 has it.