The Effects Loop Shifter Switch Patchbox allows you to switch your pedals between in front of your amp and the effects loop of your amp. Simply route all your modulation and time based effects though the send/return loop and then you can switch that loop front in front of your amplifier or into the amplifiers effects loop. This box is ideal for mounting under a pedalboard or as a patchbox where you don’t need to switch effects loop during a gig. Great for use with modulation, reverb and delay effects.