On conventional tv’s, hitting the channel +/- button or any channel numeric button will return the input back to the tv input. If your projection tv works like this, you can use this as a starting point so your macro will always return to the tv tuner, and then go from there to the input you need by adding the necessary number of tv/video buttons.
If you want to use discrete codes, you will have to get an RS/OFA remote. See this thread for more info on discrete codes. When you have digested all of the info, let us know if you have any questions.
[Link: remotecentral.com]I am not certain that discrete codes will work with your HS-10. You can always get a RS/OFA remote to test with and return it if it doesn't work.