Good morning, from Brazil, I have a PitchFactor and it has the same noise problems coming from the system, I used balanced cables and nothing changes, when I turn on the unit it works for a few minutes and then the noises start, I noticed that some effects accentuate the noises ( Harpegiador , Synthonizer , H910 / H949), already replaces the source, I used a sinusoidal UPS and it continues without conditions of use this unit, unfortunately.