BOSS PSM-5 Power supply & master switch

This is the first power distribution pedal in stompbox format from Boss. It can supply power to up to 7 other pedals. In addition it’s got a built in switch and effect loop. It’s been obsoleted by the release of the LS-2 Line Selector and the NS-2 Noise Suppressor. When the check indicator light is green, the PSM-5 is in bypass mode and the Guitar and Amp connections are connected. Press the switch and the check indicator turns red. In this mode the Guitar connection is connected to Send and the Amp connection is connected to Return.