Loop Master Channel Bypass Looper with Master Bypass - 2nd Hand
Secondhand, used but good condition.
Use as a simple interface for activating back row effects on the front row of your pedalboard.
Add true bypass capability to any effect and eliminate tone-sucking effects from your signal path. When you want them off, they'll be COMPLETELY off. (each loop grounds out the send for zero bleedover)
Use for effects that do not have on/off switches.
Chain (1) or more effects per loop. "Send" on the loop-Master connects to the "In" on your effect and "Receive" on the loop-Master connects to the "Out" on your effect. Leave the effect "on" at all times but turn it on and off via the loop-Master switch.