I have a Carvin R600 head with footswitchable eq and effects loop. The footswitch that came with the head has a TRS cable, and as far as I know is the same as most any other footswitch. I'm toying with the idea of putting LEDs in the footswitch so I can look down at the footswitch and know what's on and what's off without having to look back at my amp. Does anyone know what kind of voltage goes through the footswitch? Could I just get an LED and solder it in there with the switch? Or would I have to put a resistor in there too? Anyone?