If your Sky+ remote is fairly new or you have the Sky Navigator remote it may be possible to set the normal volume/mute controls to work your amp rather than the TV. And without pressing the TV key!
Proceed as follows
1. Program the remote as detailed above to control your amp using the arrow keys in TV mode.
3. Hold down select and press 1 until the remote's LED flashes twice (if it only flashes once or remains on steady I'm afraid your remote does not support this feature).
4. Press Sky key and enjoy.
To reverse the process press select and 2 rather than 1.
Thanks to Digitalspy forum member abailey for discovering this very useful feature.
The usual disclaimers that go with playing with undocumented featured of hardware please be careful and you can't blame us or Sky if it stops working - as far as I know none of this is supported! So technical support at Sky won't be able to help so don't ask them or we won't get any more good info Have fun and take care.