I am considering some major surgery on a relatively high-end Sony receiver, but the mod outlined below could probably be performed on receivers of any other brand as well.
When I insert the earphone plug, the speaker outputs are automatically switched off and the output is redirected to the earphone. I think that this is standard behavior for receivers. I haven't yet opened up the chassis, but it seems that the redirection is executed through a low-tech mechanical switch that is actuated by the earphone plug.
What I would like, though, is to keep the earphone plug always inserted, and to control the output via a relais (and ultimately through a wireless switch). The reason is that the rig is in my sports room, and I need to use the earphones when working out in order to avoid unnerving my family - but I always forget to plug then in at the beginning and out at the end of the workout. Hence I would like to dedicate a button on the ProntoPro remote control to that operation.
I am certain that such a mod will require some soldering, and I am prepared to do that (and potentially to risk bricking my receiver). Before I start tinkering with the receiver, however, I wanted to collect opinions and advice on (1) whether such proposition is feasible, (2) anybody has done anything like that before, and (3) what are the do's and don'ts.
Many thanks in advance for any input. Ah, if the above sounds totally stupid, feel free to bash me - I am flame-resistant!