Daniel,
Yes my remote has 4 separate input source buttons. TV is a rear projection KPR-53CX35 53". Remote is the one shipped with it- RM-Y110. I bought TV about 7 years ago.

I've tried most of the trick in the tips/tricks section here, with no luck. The MX1000 says it has learned the code (ie it says "Good!" on confirmation). But when I press the programmed button nothing happens. I'm beginning to think I've got a dud or something.