Rob,
I have an MX-500 and the preprogrammed codes for X-10 worked perfectly with my IR543. I checked Daniel's review and it does list X-10 as an Aux component so it should work for you also. If the pre-prog. codes don't work, you can always buy an X-10 remote (about $20) and teach your SL-9000. Check the link below for product specs on SL-9000. Hope this helps!
-erk
[Link: remotecentral.com]