There are a couple things you can do to find the codes you need.
One method is to start with a blank slate for a remote file and program all the sony codes into devices. Then test each one for the codes you are looking for. You might want to try all the keys on the remotes because a 'DVD' key on one might be an 'on' on another. Companies try to keep things the same but sometimes they are limited by the equipment's memory (especially with older units) and might have had to make some substitutions on their code numbers do to space limitations. Try all the power and on/off codes first obviously.
Another methos is to use the remotes IRDB navigator and test the codes you want to try right from the database while the remote is connected to your computer. I would try this method first as it is probably quicker. But, if you are going to test a lot of codes loading all the devices and going through the remote is probably faster.
If you find the code you can just drag it onto a key or into macro from the IRDB navigator. Or you could just have two audio devices and keep the one with the discrete codes 'hidden' so as not to confuse anyone using the system.
Also check if the code exists on a Pronto and use the universal browser to bring it in.
There is probably a good chance you'll be able to find the code.
