seiken....
funnily enough i'm helping a friend with similar needs as yourself.
its difficult frankly to find a decent all in one solution.
like you and my friend need for usb.
heres one...brand new never used it. might get my friend to try it.
http://namm.harmony-central.com/WNAM...s/PR/IO-2.html
roland have something new as well called the 4FX i understand.