Just acquired a vintage Dod LED Foot Switch 800. I assumed it would have a 1/4 input & a 1/4 output. I had planned to use it between my bass & my effect board to cut the signal during breaks. Yet it only has a 1/4 output, metal stomp switch & LED light. Any idea what the intended use was for this thing? Remote on/off amp switch? Used to change channels on a multi-channel amp? Any help would be appreciated.