Several years ago, I bought a budget pedalboard with a built-in power supply from my local music store. It was actually working pretty well for me, until I started adding more pedals. The more I added, the more buzz I had. I tried everything, different wall warts, several wall warts, a different (cheap) power supply. Very frustrating. After doing some research, I found the MC403. It had excellent reviews and was more than adequate to power the number and variety of pedals in my collection. So I decided to buy a Pedaltrain PT-3 and the MC403. One of the best decisions of my musical career. NO BUZZ! Highly recommended!!