Effect pedal power supply making a buzz?

Matt

New member
I bought this the other day: http://www.effectpowersupplies.com/9v-dc-regulated-power-supply-with-integrated-6-way-daisy-chain-2-p.asp

It says in the description that it 'Creates no noise or mains hum', yet when I use it there is an annoying buzz. So far I have it plugged into a Crybaby wah, a DS-1 and a Belcat Pedal tuner. The buzz becomes lower pitched if i unplug the power supply from the Crybaby, and is only created when the power supply is plugged into the DS-1, but I don't think it is my distortion that is causing the problem because I've tried it with a single ended power supply and there is no hum whatsoever.
Help? :)
I have also tried removing expired batteries from my pedals but no to avail.
 
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