With this unit i had issues with high pitch noise when connecting digital reverb and delay pedals together. Small annoying noises that became apparent as soon as playing stopped. It is not there all the time, sometimes there were no noise at all, depending of which pedals i combined. I could not find the root cause and decided to buy a power supply with insulated outputs instead (harley benton powerplant ISO 2 PRO), which have actually solved the issue completely, now i can use any combination of pedals without noise.