If you find a panasonic or technics code that controls the power, to get the volume you have to do the following: First there HAS to be a tv code programmed to the tv device, or the volume keys won't work. Then:

1. av1 or av2
2. press and hold MUTE & SELECT for two blinks
3. enter 9 9 3
4. press SELECT

The volume keys never work initially with any audio code.