This can be useful if you are using your amplifier to provide audio from a Sky box.
1, Press the TV button on your sky remote.
2, Press and hold both Select and 0 simultaneously for two seconds, until you see the LED on the remote flash twice.
3, Enter the code 1217 (just press 1, then 2, then 1, then 7).
4, The LED should once again flash twice to show that it has accepted the code.
If all went well you should now be able to control your amplifier using the arrow keys around the Select button (up and down control volume, right does the mute on/off and left the power on/off).
Although this is quite useful it only works when in TV mode so you have to toggle between Sky and TV mode all the time.
There is however, another tweak to make it almost perfect:
1, Press the TV button once.
2, Then press and hold both Select and 1 simultaneously for two seconds, until you see the LED flash twice.
This should enable 'AV punch through' mode on the remote. You should now be able to use the Mute and Volume +/- buttons when the remote is in Sky mode. You can disable 'punch through' mode with Select and 2 if you ever decide to in the future.