2 buttons at the same time? You may have to set up a "blind" (something like a book or magazine) to block the first part of the signal. I had to do this to learn the direct access buttons for my Sony TV, which were also dual-button codes.

As for Sony inputs, it's a good thing most come preprogrammed. If you need any additional ones you may have to do a simular "blind" with timing. It's not the fault of Home Theater Master, but Sony sends out multiple codes on those buttons which no universal remote can learn.