> it's a charme but roland don't check the last drivers for is products so i can't use my Midi A-500 pro I wait but no longer
It has a MIDI out socket, do you have a MIDI interface?
Win 7 drivers
may work, I'd be interested to know as I have a A-300. Windows 8 may even provide generic drivers.
I think Roland Octapad SPD-30 should work as that uses generic USB drivers in Win 7, so Win 8 should be the same in theory.
If Roland are any good there're be releasing Windows 8 drivers soon. Fingers crossed.