I don't think plugging them in to see what they do would put a amp at risk ? Plug them in to your least expensive amp and see what they do ? ( sounds kinda fun really ) If something goes wrong I'll send you another amp or compensate you however you want ! I'd like to believe that a fellow brother would not put a broken or unpredictable pedal that might cause damage in the Mystery Box ? Do you have a little frontman or SP-10 laying around ? I have your back !