Can anyone help with adding a IR relay like the one in the video to an existing PC speaker system. It's a 5.1 set up and plugs into an outlet with a 3.5mm output. The power button is on one of the satellite speakers and I want to use an IR receiver to turn on and off the system. I guess mainly what I want to know is do I need an external power source for the relay or can it work off of the speakers? It also has a knob for volume. Would it be possible to connect that also? Another thing...I was researching relays, would I need to use that, or should I use that instead. I just want to turn the speakers on and off at the moment to experiment. I can add pics of the internal components if needed. Thanks!