Backlineverket FX/Loop Series Interface
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The simplest way to switch between 2 and 4 cable method without having to rearrange your whole pedalboard.
Connect with four cables for a setup with the amplifiers fx loop.
If you don't have a loop and want to use all pedals in series before the amp, just use the RTN jack as pedalboard output and connect to your amplifiers input. The interface is switched and will automatically put both pedal chains in series before the amp.