I apologize if this is a known and often discussed problem: My dad has the SKB Stage 5 pedal board and was having problems with his Electro-Harmonix pedals, Holy Grail Reverb and Memory Man. The pedals work for a minute or 2 and then either stop processing any effects or make a noise like a plane taking off. Strange thing is both pedals work perfectly on my One Spot Power Supply. All his other pedals work fine using the same power outputs and cables. Anything about these pedals or the power supply in the pedal board that would cause this? We were using the 9V DC power outputs, not the variable outputs, 12/18volt outputs or the 9V AC just FYI.