Your best bet is to use receiver code 0158 and misc audio code 0159. Check out the advanced code lists on my site to see the key mapping.
You can re-program the functions to any button you like using the advanced codes, instructions are in the manual which is also on my site.
You may have a problem with the DSP surround functions as they hare hard to reproduce on some Sony's.
Rob.
http://www.hifi-remote.com/