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stereo setup noise idea needed

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 I have the helix on a not so large room, with 2 tube amp on clean ,  in stereo, I am going from the helix to the amp  from the left and right instrument cable output on the helix , NOT  the 4 cables Method, and I have this electrical HUMM, that is quite common  when you hook two tube  amps, with a digital moduler in between, is not so loud , but for prolonged playing time, it builds up on the  ear becoming very annoying . 

so far I tried the ground lift on the back and doesn't help, maybe anyone know a trick or a sort of buffer or a magic pedal that isolates the amps from the electrical current that is creating the noise? 

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