The Boss FS-5U is a footswitch with a quality metal chassis and polarity switching capability. It is a momentary "unlatch" type footswitch that activates the desired function (effect) only while the pedal is depressed. So you can use the FS-5U for example to set the Tap Tempo delay effect, as a sustain pedal for keys or to activate effects that excel in momentary mode.
The footswitch can simply be attached to another FS-5U model, or to the FS-5L "latch-type" switch, and interconnected.
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