I was wondering whether it is possible to 'download' all the midi files (songs and especially kits (individual sounds)) of Roland V-drums.
sound? highly doubtful. You could try sampling it, but that is pretty painful. You might find it at http://samples.kb6.de/downloads.php
midi - check your manual, otherwise see if it sends midi out that you can record with a pc midi sequencer to save to a midi file.
good luck to ya.