I use the DR-880, but use the USB port.
I downloaded the latest 64 bit win7 drivers
on 7-9-2012.
NO problem what so ever!
I usually run a Cakewalk CAL routine to seperate the MIDI notes to
seperate tracks, from there, I can use automation on a "per note" basis.
This gives me individual control of "the kits" note levels when using "velocity".
Any volume changes on midi CH 10, of course, scales the whole midi channel
for all notes, but using "velocity" helps tame a single percussion instrument to fit
better in the mix.
If you can, try the USB interface on the DR-880.
I had good results this week.
take care
Don Belisle
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ACER i5, Q6600 desktop, XP SP3 and Win 7 home edition
MOTU Ultralite III, X1D -w- all PC updates.