Whahaha and it goes on.
I'm surprised that someone who claims to have bent an R-8 needs advice for an R-5.
In the meanwhile, I have bent my second R-5. It's the same standard procedure as I described in my posts about the R-8 bend, find sound roms (there are two just side by side, 28pin or 32pin, don't remember) and do the usual shorting. The FTQP or what-wasit-called SMD chip nearby seems to be the usual gate array Roland always uses, and has the most interesting ones. Sorry that I can't supply any pictures at the moment, but any half-experienced bender should be able to easily do an R-5 like that.
At the back there is space for a DB25 connector conviently just above/behind the solder side of the sound roms, you just have to cut out the metal reinforcment plate for that. I built an external box which connects like that. Apart from the mechanical work, I have to say all in all an R-5 is pretty easy to bend and sounds all fun again:
http://lonestar.madtracker.net/Musix/TR-5.mp3And now get out your R-5s and have fun!
EDIT: I have found a pic of my first R-5
On this one I fit the DB25 connector to the side, but from that view below the sound roms there is the space I talked about.
That pic should help to locate everything needed.