Wessel wrote
I have looked but they don't have amps there . If the light burns indacating its on will that mean yhe sound is going through
No. I have a Double Muff that gets power but does nothing else. Don't you have a small practice amp or a friend who has one that you can take with you to test the pedals ? You could also test it through a PA if they have one. Might not sound that grand, but atleast you'll know they work.