well you can go and buy a midi port that plugs into your cpu (computer) at your
local music store or at http://www.musiciansfriend.com/
midi port will coast about $40 and up

then you can buy this software http://www.squest.com/Windows/Instruments/jv-80/
this will cost you a little money $200.
this will covert the files for the jv 1000
it fast and easy but will cost a little
------------------------------------------
this is a little work and a very cheap
you could buy a midi cable that plugs into
you sound card they are not very much $20.

and go to download.com and get a free midi
software.

once you do this you can play the midi drum
file on your cpu & record it in to your
jv 1000

have fun