Can the Sony RM-VL 900 do X-10? I keep reading about the 2100 working with an IR543 and was wondering if I can do that with my 900.

Also I have a Pioneer receiver that cycles through the various devices with a fuction key. There is no one button that can be pressed to select, say TV. How can I program the 900 to operate a macro that will select the correct device on the amp. Right now when the amp is powered on whatever device that was selected last is what I get.

can the 900 learn codes from other remotes

Re X10, you'll need another remote to learn the signals off of.

Re input codes, unless you have those codes somewhere else, no. It's possible the VL900 comes with some built-in, but I wouldn't bet on it. :-)

Yes it will learn codes from other remotes and it will probably learn the code for your function key mine worked for my sony vcr remote which has keys that work double functions press once for one function and press and hold for another.