Constant volume regulation from cable box output ?

Trying to find a devive that will regulate or keep the gain from my cable box at a consatant volume so the commercials will remain at the same volume. Any help would be much appreciated.

A remote control.
If you mean the analog outputs then take a look at this - TERK VR-1 TV VOLUME REGULATOR on the parts express web site
TThe Terk is exactly what I'm looking for!!

Mike M