tc chorus hums in my pedal board

[emerswin]

Hello there,
I have a TC elctronics chorus/pitch mod/flanger. It has built in power, with the 2 prong plug/power chord. It creates a noticable hum in when I put it in my pedal board and power via a voodoo labs pedal power. Any ideas on how to solve this? Thanks!

[emerswin]

anyone?

all the other pedals in the board are fine, just seems like this one isn't grounded the same....