If you find a working code for power under either panasonic or technics, to get the volume which NEVER works initially with ANY audio code. Reason is the volume keys won't work without a tv code programmed to the tv device, once there is a tv code its volume is now in the way. But that can be remedied:

So with partially working audio code progrsammed to the av1 or av2 device, a tv code in, to get the volume in a single device:

1. av1 or av2
2. press and hold MUTE & SELECT, wait for two blinks, release
3. enter 9 9 3
4. press VOL DOWN

If you want audio volume in ALL devices do the following instead:

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