I had sent my MSR to Universal Remote to have them teach its codes to the MX-700 (same as MX-800?). Problem codes tended to be anything that 'toggled' values. They did this for me and returned the remotes with great sucess. The folks there did a good job of it with only one small complaint - They didn't bother to teach all of the MSR codes, only the DVD specific ones (I did ask for all and provided the MSR.4 datasheet but they knew I was having problems with the DVD functions). Luckily, between the DVD codes learned, the existing 500 series codes provided with the MX700, and teaching a few single state codes it all works now. I asked what special process they had to do and basically, they said that it was the same as what you & I would have to do. Point and learn. After spending (way too) many hours attempting to teach the toggle codes I gave up. They must have better skills at this then I.
I submitted the (DVD) file to Remote Central
http://www.remotecentral.com/ today so hopefully it will be up soon. It will be under Meridian-DVD.
If the 800 series uses the MSR.4 codes then it should work too...
Rod.