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If you just wanted to use the ls2 to trigger the wah on and off you could hook the wah up to a loop. If its hooked up to loop a for example use a/bypass BUT this will not work as a blend it'll act as a volume. In order to use the ls2 as a blend you'll have to use a+b/bypass mode, hook the wah to one loop and just connect both ends of another cable into the send and return of the other loop.